sap iitr lecture notes

Analysis And Design Of Four Storied RC Building Using SAP2000 v12 21 November 2008

ANALYSIS AND DESIGN OF FOUR STORIED RC BUILDINGS USING SAP2000 v12

Vijay Namdev Khose

Research Scholar, Department of Earthquake Engineering, IIT Roorkee Q Analyse and design four storied building as shown in Fig.1 & 2 using SAP2000 v12

Fig.1 Plan of the building

Fig. 2 Elevation of building

2 m

3 m

3 m

Y4

Y3

Y2

Y1 X1

3 Nos @ 5m C/C

X4 X2 X3

Z6

3.1

Z5

3.1

Z4

3.1

Z3

3.1

1.2 Z1

Z2

For any suggestions and queries please write to Mr. VIJAY N. KHOSE, [email protected] Page 1 of 44


Building details are as follows

1. Grade of concrete used is M 20 and grade of steel used is Fe 415.

2. Floor to floor height is 3.1 m

3. Plinth height above GL is 0.55 m.

4. Depth of Foundation is 0.65 m below GL

5. Parapet height is 1.5 m.

6. Slab Thickness is 150 mm.

7. External wall thickness is 230 mm and internal wall thickness is 150 mm.

8. Size of columns is 300mm X 450 mm and size of beams 300mm X 450 mm.

9. Live load on floor is 3kN/m2 and Live load on roof is 1.5kN/m2.

10. Floor finishes is 1 kN/m2 and roof treatment is 1.5 kN/m2

11. Site located in Seismic Zone IV.

12. Building is resting on medium soil.

13. Take Importance Factor as 1.

14. Building frame type is Special Moment Resting Frame (SMRF).

15. Density of concrete is 25 kN/m3and Density of masonry wall is 20 kN/m3



Step 1 Begin a New Model In this Step, the basic grid that will serve as a template for developing the model will be

defined.

A. Click the File menu > New Model command or the New Model button . The

form shown in Fig. 3 will display. Verify that the default units are set to KN, m, C.

B. The New Model form

allows for the quick

generation of numerous

model types using

parametric generation

techniques. However, in

this tutorial the model will

be started using only the

grid generation. When

laying out the grid, it is

important that the geometry

defined accurately represents

the major geometrical aspects of the model, so it is advisable to spend time

carefully planning the number and spacing of the grid lines. Select the Grid Only

button, and the form shown in Fig. 4 will display.

Fig.3 New Model form

C. The Quick Grid Lines form (Fig. 4) is used to specify the grids and spacing in the X, Y and Z directions. Set the number of grid lines to 4 in the X and Y direction,

and to 6 in the Z directions. Type 5, 3, 3.1 into X, Y, Z directions spacing edit

boxes respectively. The values specified in the First Grid Line Location area

locate the origin of the grid lines; make sure that these values are all set to zero

for this tutorial. Click the OK button to continue.

1. Click the Define menu > Coordinate Systems/Grids command. The

Coordinate/Grid Systems form will display. Make sure that the Systems

item on the Coordinate/Grid Systems form has Global highlighted and



Fig. 5 Define Grid Data form Fig. 4 Quick Grid lines form

Fig. 6 SAP 2000 Windows



click the Modify/Show System button. The Define Grid Data form (Fig.

5) will display.

2. The Define grid data form is used to specify the irregular spacing in the X,

Y and Z directions. Set the Display Grid as to spacing.

3. In Y Grid Data set spacing as 2 for Grid ID 2 and in Z Grid Data set it to

1.2 for z1 Grid ID.

4. Click the OK button to close the Define Grid Data form.

D. Click the OK button to close the Coordinate/Grid Systems form, and Fig. 6 will

appear. The grids appear in two view windows tiled vertically, an X-Y Plan

View on the left and a 3-D View on the right, as shown in Fig. 6. The number of

view windows may be changed by selecting the Options menu > Windows

command.

Notice that the Plan view is active in Fig 6. When the window is active, the

display title bar is highlighted. Set a view active by clicking anywhere in the view

window.

Note that the Global Axes are displayed as well, and that Z positive is in the up

direction. When SAP2000 refers to the direction of gravity, this is in the negative

Z direction, or down.

Step 2 Define Material Use the Define menu > Materials command

to add, modify, or delete a material property

definition. The material property definitions

are then used in defining the structural objects

(frame sections, cable sections, tendon

sections, area sections, solid properties).

A. Click the Define menu > Materials

command, the Define Material form (Fig.

7) will display. Fig. 7 Define Materials form



Highlight a 4000Psi in the Materials display list. Then Click the Modify/Show

Material button, the form shown in Fig. 8 will display.

Fig. 8 Material Property Data form -Concrete Fig. 9 Material Property Data form -Rebar

B. In Material Name and display color edit box, type M20 and in Material Type select

concrete from drop down list.

C. Set Weight per unit Volume as 25. Set Modulus of Elasticity to 22360679.774

( ckf5000 as per IS 456). Set Poissons Ratio to 0.15. Set Specified Concrete

Compressive Strength to 20000 and then click OK button.

D. Highlight a A992fy50 in the Materials display list. Then Click on Modify/Show

Material button, the form shown in Fig. 9 will display.

E. In Material Name and display color edit box, type Fe415 and in Material Type select

Rebar from drop down list.

F. Set Minimum yield stress, fy and Minimum tensile stress, fu to 415000. Set Expected

yield stress, fye and Expected tensile stress, fue to 518750 and then click OK buttons

on Material Property Data form and Add materials form to exit all forms.



Step 3 Define Frame Section

Defining a frame section makes the

section available for assignment to

selected frame objects. The Define menu

> Frame Sections command can be used

to (a) import sections from predefined

databases, (b) define frame section

properties on the basis of their

dimensions, (c) review and modify

section properties, and (d) delete section properties. Fig. 10 Frame Properties form

A. Click the Define menu > Section Properties > Frame Sections command, which

will display the Frame Properties form (Fig. 10).

B. Click the Add New Property button, which will display form shown in Fig. 11

C. In Frame Section Property Type select Concrete from drop down list and click the

Rectangular button, which will display from shown in Fig. 12.

1. In Section Name Area, Type C-300X450.

2. In Depth and Width edit box, Type 0.45 and 0.3 respectively.

D. Click the Concrete Reinforcement button, Reinforcement data form (Fig. 13)

will appear.

1. In Rebar Material Area, Select Fe415 from list as a Rebar Material of

Fig. 12 Rectangular Section form Fig. 11 Add Frame Section Property form



Longitudinal Bars and Confinement Bars (Ties).

2. In Design Type Area, Select Column (P-M2-M3Design) option.

3. In Configuration of reinforcement area, select Rectangular.

4. In Longitudinal Bars - Rectangular Configuration area, Type 0.05 in

Cover to for confinement bars edit box.

5. In Confinement Bars Area, Select 8d from drop down list as Confinement

Bar Size; Type 0.2 in Longitudinal Spacing of Confinement Bars edit box

and Type 2 in Number of Confinement Bars in 3-dir and 2-dir.

6. In Set Check/ Design Area, select Reinforcement to be Designed.

7. Click OK buttons on Reinforcement Data form and Rectangular section form.

E. Click the Add New Property button, which will display form shown in Fig. 11.

F. Make sure that in Frame Section Property Type, Concrete is selected and click the

Rectangular button, which will display from shown in Fig. 12.

1. In Section Name Area, Type B-300X450.

2. In Depth and Width edit box,

Type 0.45 and 0.3 respectively.

Fig. 13Reinforcement Data form for Column Fig. 14Reinforcement Data form for Beam



G. Click the Concrete Reinforcement button, Reinforcement data form (Fig. 13)

will appear.

1. In Rebar Material Area, Select Fe415 from list as a rebar material of

Longitudinal Bars and Confinement Bars (Ties).

2. In Design Type Area, Select Beam (M3Design only) option, which will

display reinforcement data form (Fig.14) for beam.

3. In Concrete Cover to Rebar Center Area, Type 0.03 Top and Bottom edit box.

4. Click the OK buttons on Reinforcement Data form, Rectangular section form

and frame properties form.

Step 4 Add Frame Objects In this Step, Frame objects with the associated column and beam sections list are drawn

using the grids and snap-to options, and generated using Edit menu commands.

Draw Frame Objects (XZ Plane) Make sure that the X-Z Plane @ Y= 0 views is active (see Step1-D for directions on how

to make a view active). This view should be in the left window. Also check that the Snap

to Points and Grid Intersections command is active. This will assist in accurately

positioning the frame objects. This command is active when its associated button is

depressed. Alternatively, use the Draw menu > Snap to > Points and Grid

Intersections command. By default, this command is active.

A. Click the View menu > Set 2D View command.

B. In the Set 2D View form click on the X-Z plane option. Type 0 into the Y = edit

box to display the Side view at Y = 0, and click OK.

C. Click the Draw Frame/Cable/Tendon button or use the Draw menu > Draw

Frame/Cable/Tendon command. If you accessed the Draw

Frame/Cable/Tendon command via the Draw menu, the Draw

Frame/Cable/Tendon button will depress verifying your command selection.

The Properties of Object pop-up form for frames will appear as shown in Fig.15.



If the Properties of Object form is

covering any part of the model in

either view, click on the title bar

and drag it out of the way.

D. Click in the Section drop-down

list on the Properties of Object

form and scroll down to C-

300X450. Single click on it to assign th

Fig. 15 Properties of Objects

e auto select list C-300X450 to the

members you will draw.

E. To draw the columns, left click once in the X-Z Plane view at the X-Z origin, and

then go on clicking at the nodes (X=0, Z=1.2), (X=0, Z=4.3), (X=0, Z=7.4), (X=0,

Z=10.5) and (X=0, Z=13.6) i.e. nodes along the vertical grid line X =0. The

cursor location is indicated in the lower right-hand corner of the interface. A

frame lines should appear in both views (Side and 3D). After clicking to define

the end point of the column, a right click will lift the pen so you will no longer

be actively drawing, but will leave the Draw Frame/Cable/Tendon command

active so that you may add additional objects. If you have made a mistake while

drawing this object, click the Select Object button, to leave the Draw mode

and go to the Select mode. Then click the Edit menu > Undo Frame Add

embers form the columns of XZ frame at Y = 0. Right click to

on it to assign the auto select list B-

7.4, Z=10.5 and

command, and repeat Items C-D.

F. Repeat Item E to draw additional columns along the Grid line X=5, X=10 and

X=15. These m

stop drawing.

G. Click in the Section drop-down list on the Properties of Object form (Fig. 15) and

scroll down to B-300X450. Single click

300X450 to the members you will draw.

H. Repeat Item E to draw beams along grid line Z=1.2, Z=4.3, Z=

Z= 13.6. These members form the complete XZ frame at Y = 0.

I. Click the Select Object button, or Press the Esc key on the key-board to exit

e Draw Frame/Cable/Tendon command. th



Add Restraints In this step, supports for the frame are defined. Make sure that the X-Y Plane @ Z=0

mode.

ing up the Joint Restraints

view is active, and that the program is in the Select

A. Select the support nodes i.e. nodes at Z=0.

B. Click the Assign menu > Joint > Restraints

command to br

form (Fig. 16).

C. Click the Fixed support button to

assign restraints in the Translation and

Rotation in 1, 2 and 3 directions. Click OK

to accept the changes.

Modify Column Orientation

To better view the column orientation, click the Set Display Options button. When

the form (Fig. 18) appears, check the Fill Objects

Fig. 16 Joint restraints form

and

ssign menu > Frame > Local Axes

Extrude view check box and the Apply to All Window

check box, as shown in Fig.18.

A. Select all the columns along the grid line X=0 and

X =15.

B. Click the A

command to access the Frame Local Axis form

(Fig. 17). Fig. 17 Frame Local Axis Form

Fig. 18 Display Options for Active Window



C. Type 90 in Angle in degrees edit box. Click OK to accept changes.

0 by left clicking directly on the

object, holding the left mouse button

member. See Fig. 19 for selection

B. lick the Edit menu > Replicate command to bring up the form shown in Fig.

the Linear tab, type 3 into the dy edit box. Type 1 in the Number edit box.

Replicate Objects Make sure that the program is in the Select mode.

A. Select the complete XZ plane frame at Y=

members, or left clicking to the right of the

down, and dragging the mouse across the

options.

C

Fig. 19 Graphical selection options

20.

C. On

Click the OK button.

D. Repeat Item A-B.



E. On the Linear tab, type 5 into the dy edit

F. Again repeat Item A-B

dy edit

on the Y-Z plane option. Type 0 into the

box. Type 1 in the Number edit box.


G. On the Linear tab, type 8 into the

box. Type 1 in the Number edit box.


Draw Frame Objects (YZ Plane) Make sure that the Y-Z Plane @ X= 0 view is active Or Click the View menu > Set 2D

View command. In the Set 2D View form click

Fig. 20 Replicate form

X = edit box to display the Side view at X = 0, and click OK.

A. Click the Draw Frame/Cable/Tendon button or use the Draw menu > Draw

Frame/Cable/Tendon command. The Properties of Object pop-up form for

) and

C. Draw beams along Grid line Z=1.2, Z=4.3, Z=7.4, Z=10.5 and Z=13.6. These

he complete YZ frame at X = 0. Right click to stop drawing.

frames will appear as shown in Fig.15.

B. Click in the Section drop-down list on the Properties of Object form (Fig. 15

scroll down to B-300X450. Single click on it to assign the auto select list B-

300X450 to the members you will draw.

members form t

D. Click the Select Object button, or Press the Esc key on the key-board to exit

the Draw Frame/Cable/Tendon command.

Replicate Objects .

Z plane frame at X=0.

mand to bring up the form shown in Fig.

20.

button.

Make sure that the program is in the Select mode and Y-Z Plane @ X= 0 views is active

A. Select all the beams in Y

B. Click the Edit menu > Replicate com

C. On the Linear tab, type 5 into the dx edit box. Type 3 in the Number edit box.

D. Click the OK



Step 5 Define Load Patterns The loads used in this problem consist of Dead, Dead Wall, Dead Slab, Dead FF (Floor

finish), Dead RT (Roof treatment), Live and Live Roof loads acting in the gravity

direction.

A. Click th

Dead Load case with self-weight (DE

t the self-weight multiplier is set to 1 for the default case. This indicates that

atically include 1.0 times the self-weight of all members.

E. Type the name of the new load pattern, LIVE ROOF. Select ROOF LIVE, a Type

of load from the drop-down list. Make sure that the Self Weight Multiplier is set to

zero. Click the Add New Load Pattern button to add the Live load to the load list.

e Define menu > Load Patterns command to bring up the Define Load

Patterns form (Fig. 21). Note there is a single default load case defined, which is a

AD).

Note tha

this load pattern will autom

In SAP2000, both Load Patterns and Load Cases exist, and they may be different.

However, the program automatically creates a corresponding Load case when a load

pattern is defined, and the load cases are available for review at the time the analysis

is run.

B. Click in the edit

box for the

Load Pattern

Name column.

Type the name

of the new load Fig. 21 Define load Patterns form pattern, DEAD Wall. Select a Type of load from the drop-down list; in this case,

select SUPER DEAD. Make sure that the Self Weight multiplier is set to zero. Click

the Add New Load Pattern button to add the Dead Wall load to the load list.

C. Repeat item B, to add Dead Slab, Dead FF, Dead RT load cases.

D. Type the name of the new load pattern, LIVE. Select LIVE, a Type of load from the

drop-down list. Make sure that the Self Weight Multiplier is set to zero. Click the

Add New Load Pattern button to add the Live load to the load list.



F. The Define Loads form should now appear as shown in Fig. 22. Click the OK button

in that form to

accept the

newly defined

static load

cases.

Fig. 22 Define load Patterns form

Step 6 Assign Gravity Loads In this Step, the Dead and Live loads will be applied to the model.

Assign DEAD WALL load Make sure that the X-Y Plane @ Z=1.2 view is active, and that the program is in the

select mode.

A. Select the all external walls in X-Y Plane at level Z=1.2, Z= 4.3, Z=7.4 & Z=10.5.

If you make a mistake in selecting, press the Clear Selection button, and try

again. Use the Move Up in list and Move Down in List buttons to

change floor level.

B. Click the Assign menu > Frame Loads > Distributed command. This brings up

the Frame Distributed Loads form (Fig. 23).

1. Select DEAD WALL from the Load Case Name drop-down list. New Load

Pattern can be added by clicking New Load Pattern button, if required.

2. In Units, Verify that the KN, m, C option is selected.

3. In the Load Type and Direction area, verify that the Forces option is selected

and that the Gravity direction is selected.

4. In the Options, select the Replace Existing Loads Option.



5. Type 12.19 (value of

external wall load

intensity) in the Uniform

Load edit box. Remember

that the Gravity Direction

is in the negative Global Z

direction.

6. In the Trapezoidal loads

area, verify that in all Load

edit boxes values are zero. Fig. 23 Frame Distributed Loads form 7. Click the OK button to

accept the DEAD WALL load.

C. Select all internal walls in X-Y Plane at level Z=1.2, Z= 4.3, Z=7.4 & Z=10.5.

D. Click the Assign menu > Frame Loads > Distributed command.

1. In Load Case Name, Verify that Dead Wall is selected.


3. Type 7.95 (value of internal wall load intensity) in the Uniform Load edit

box

4. In the Trapezoidal loads area, verify that in all Load edit boxes values are

zero.

5. Click the OK button to accept the Dead Wall load.

E. Make sure that the X-Y Plane @ Z=13.6 views is active, and that the program is in

the Select mode. Select all external walls.

F. Click the Assign menu > Frame Loads > Distributed command.

1. In Load Case Name, Verify that DEAD WALL is selected.


3. Type 6.90 (value of parapet wall load intensity) in the Uniform Load edit

box

4. In the Trapezoidal loads area, verify that in all Load edit boxes values are

zero.

5. Click the OK button to accept the DEAD WALL load.



Assign DEAD SLAB load In this tutorial Slab load is transferred to adjacent beams and Rigid Diaphragm is

assigned to simulate the in-plane slab rigidity. Yield line pattern for slab load is shown in

Fig.24.

X4 X3 Fig. 24 Yield line pattern for slab load

X2

Y4

Y2

Y3

Y1

X1

Make sure that the X-Y Plane @ Z=4.3 view is active, and that the program is in the

select mode.

A. Select the all beams in X-Y Plane along line Y=0, Y=3, Y=5 and Y=8 (i.e. beams

along Y1, Y2, Y3 and Y4 in Fig. 24) at level Z= 4.3, Z=7.4, Z=10.5 & Z=13.6). Use

the Move Up in list and Move Down in List buttons to change floor

level.

B. Click the Assign menu > Frame Loads > Distributed command.

1. Select DEAD SLAB from the Load Case Name drop-down list.


3. In the Trapezoidal loads area, select the Absolute Distance From End I

option.

a. In Trapezoidal loads area, type 0 in first Distance and Load edit

boxes.

b. Type 1.5 in second Distance edit box and type 5.625 in second

Load edit box.



c. Type 3.5 in third Distance edit box and type 5.625 in third Load

edit box.

d. Type 5 in fourth Distance edit box and type 0 in fourth Load edit

box

4. In the Uniform load area, Type 0 in Load edit box.

5. Click the OK button to accept the DEAD SLAB load.

C. Select the all beams in X-Y Plane along line Y=3 and Y=5 (i.e. beams alongY2 & Y3

in Fig. 22) at level Z= 4.3, Z=7.4, Z=10.5 & Z=13.6).


1. In Load Case Name, Verify that DEAD SLAB is selected.

2. In the Options, select the Add to Existing Loads Option.

3. In the Trapezoidal loads area, Type 0 in all Load edit boxes.

4. In the Uniform load area, Type 3.75 in Load edit box.


E. Select the beams having 3m length in X-Y Plane along line X=0, X=5, X=10 and

X=15(i.e. beams along X1, X2, X3 and X4 in Fig. 24) at level Z= 4.3, Z=7.4, Z=10.5

& Z=13.6).





option.


boxes.


Load edit box.


edit box.


box.





G. Select the beams having 3m length in X-Y Plane along line X=5 & X=10 (i.e. beams

along X2 and X3 in Fig. 24) at level Z= 4.3, Z=7.4, Z=10.5 & Z=13.6).

H. Click the Assign menu > Frame Loads > Distributed command.




option.


boxes.


Load edit box.


edit box.


box.


5. Click the OK button to accept the Dead Slab load.

Assign DEAD FF (Floor Finish) load Make sure that the X-Y Plane @ Z=4.3 view is active, and that the program is in the

select mode.

A. Select the all beams in X-Y Plane along line Y=0, Y=3, Y=5 and Y=8 (i.e. beams

along Y1, Y2, Y3 and Y4 in Fig. 24) at level Z= 4.3, Z=7.4and Z=10.5).


1. Select DEAD FF from the Load Case Name drop-down list.








option.


boxes.

b. Type 1.5 in second Distance edit box and type1.5 in second Load edit

box.

c. Type 3.5 in third Distance edit box and type1.5 in third Load edit

box.

d. Type 5 in fourth Distance edit box and type 0 in fourth Load edit box


7. Click the OK button to accept the DEAD FF load.

C. Select the all beams in X-Y Plane along line Y=3 and Y=5 (i.e. beams along Y2 and

Y3 in Fig. 24) at level Z= 4.3, Z=7.4and Z=10.5).


1. In Load Case Name, Verify that DEAD FF is selected.






X=15 (i.e. beams along X1, X2, X3 and X4 in Fig. 24) at level Z= 4.3, Z=7.4and

Z=10.5).

F. Click the Assign menu > Frame Distributed command.




option.


boxes.

b. Type 1.5 in second Distance edit box and type 1.5 in second Load

edit box.



c. Type 1.5 in third Distance edit box and type 1.5 in third Load edit

box.

d. Type 3 in fourth Distance edit box and type 0 in fourth Load edit box.



G. Select the beams having 3m length in X-Y Plane along line X=5 & X=10 (i.e. beams

along X2 and X3 in Fig. 24) at level Z= 4.3, Z=7.4and Z=10.5).





option.


boxes.


edit box.


box.

d. Type 3 in fourth Distance edit box and type 0 in fourth Load edit box.



Assign DEAD RT (Roof Treatment) load Make sure that the X-Y Plane @ Z=13.6 views is active, and that the program is in the

select mode.

A. Select the all beams in X-Y Plane along line Y=0, Y=3, Y=5 and Y=8(i.e. beams

along Y1, Y2, Y3 and Y4 in Fig. 24).


1. Select DEAD RT from the Load Case Name drop-down list.




3. In the Load Type and Direction area, verify that the Forces option is

selected and that the Gravity direction is selected.



option.


boxes.

b. Type 1.5 in second Distance edit box and type2.25 in second Load

edit box.

c. Type 3.5 in third Distance edit box and type2.25 in third Load edit

box.


box


7. Click the OK button to accept the Dead RT load.

C. Select the all beams in X-Y Plane along line Y=3 and Y=5 (i.e. beams along Y2,

and Y3 in Fig. 24).


1. In Load Case Name, Verify that DEAD RT is selected.



4. In the Uniform load area, Type 1.5 in Load edit box.

5. Click the OK button to accept the DEAD RT load.


X=15 (i.e. beams along X1, X2, X3 and X4 in Fig. 24).





option.




boxes.


edit box.


box.


box.


5. Click the OK button to accept the DEAD RT load.

G. Select the beams having 3m length in X-Y Plane along line X=5 & X=10 (i.e.

beams along X2 and X3 in Fig. 24).





option.


boxes.


edit box.


box.


box.


5. Click the OK button to accept the Dead RT load.



Assign LIVE Load A. Select the all beams in X-Y Plane along line Y=0, Y=3, Y=5 and Y=8 at level Z= 4.3,

Z=7.4 & Z=10.5 (i.e. beams along Y1, Y2, Y3 and Y4 in Fig. 24).


1. Select LIVE from the Load Case Name drop-down list.






option.


boxes.


edit box.


box.


box


7. Click the OK button to accept the LIVE load.

I. Select the all beams in X-Y Plane along line Y=3 and Y=5 at level Z= 4.3, Z=7.4 &

Z=10.5 (i.e. beams along Y2 and Y3 in Fig. 24).

J. Click the Assign menu > Frame Loads > Distributed command.

1. In Load Case Name, Verify that LIVE is selected.







K. Select the beams having 3m length in X-Y Plane along line X=0, X=5, X=10 and

X=15 at level Z= 4.3, Z=7.4 & Z=10.5 (i.e. beams along X1, X2, X3 and X4 in Fig.

24).

L. Click the Assign menu > Frame Loads > Distributed command.

1. Select Live from the Load Case Name drop-down list.



option.


boxes.


edit box.


box.


box.



M. Select the beams having 3m length in X-Y Plane along line X=5 & X=10 at level Z=

4.3, Z=7.4 & Z=10.5 (i.e. beams along X2 and X3 in Fig. 24).

N. Click the Assign menu > Frame Loads > Distributed command.

1. Select Live from the Load Case Name drop-down list.



option.


boxes.


edit box.


box.




box.



Assign LIVE ROOF load Make sure that the X-Y Plane @ Z=13.6 views is active, and that the program is in the

select mode.

A. Select the all beams in X-Y Plane along line Y=0, Y=3, Y=5 and Y=8.


a. Select LIVE ROOF from the Load Case Name drop-down list.

b. In Units, Verify that the KN, m, C option is selected.

c. In the Load Type and Direction area, verify that the Forces option is

selected and that the Gravity direction is selected.

d. In the Options, select the Replace Existing Loads Option.

e. In the Trapezoidal loads area, select the Absolute Distance From End I

option.

1. In Trapezoidal loads area, type 0 in first Distance and Load edit

boxes.

2. Type 1.5 in second Distance edit box and type 2.25 in second Load

edit box.

3. Type 3.5 in third Distance edit box and type 2.25 in third Load edit

box.

4. Type 5 in fourth Distance edit box and type 0 in fourth Load edit

box

f. In the Uniform load area, Type 0 in Load edit box.

g. Click the OK button to accept the Live Roof load.

C. Select the all beams in X-Y Plane along line Y=3 and Y=5


a. In Load Case Name, Verify that Live Roof is selected.

b. In the Options, select the Add to Existing Loads Option.



c. In the Trapezoidal loads area, Type 0 in all Load edit boxes.

d. In the Uniform load area, Type 1.5 in Load edit box.

e. Click the OK button to accept the Live Roof load.


X=15



b. In the Options, select the Replace Existing Loads Option.

c. In the Trapezoidal loads area, select the Absolute Distance From End I

option.


boxes.


edit box.


box.

4. Type 3 in fourth Distance edit box and type 0 in fourth Load edit

box.

d. In the Uniform load area, Type 0 in Load edit box.

e. Click the OK button to accept the LIVE ROOF load.

G. Select the all beams in X-Y Plane along line X=5 & X=10



b. In the Options, select the Add to Existing Loads Option.

c. In the Trapezoidal loads area, select the Absolute Distance From End I

option.


boxes.


edit box.




box.

4. Types 3 in fourth Distance edit box and type 0 in fourth Load edit

box.

d. In the Uniform load area, Type 0 in Load edit box.

e. Click the OK button to accept the LIVE ROOF load.

Step 7 Assign Rigid Diaphragm Make sure that the X-Y Plane @ Z=4.3 view is active, and that the program is in the

select mode. A. Select all the nodes at Z= 4.3, Z=7.4, Z=10.5 & Z=13.6 level.

B. Click the Assign menu > Joint >Constraints command. This brings up the

Assign/Define Constraint form (Fig. 25).

C. In the Choose Constraint Type to Add area, click the drop-down list and select

Diaphragm.

D. Click the Add New Constraint button, which will display Diaphragm Constraint

form (Fig. 26).

E. Type Floor Diaphragm in the Constraint

Name edit box.

F. Verify that the Z Axis option is selected in

Fig. 26 Assign/Define Constraints form Fig. 25 Assign /Define Constraints form



the Constraint Axis area.

G. Check Assign a different diaphragm constraint to each different selected Z level

and the Assign/Define

constraints forms to exit all forms.

s the function and that is specified

e Function Type to Add area, Select Spectrum from File from

tton, which will display Response Spectrum

Name

on

box.

H. Click the OK buttons on the Diaphragm Constraint

Step 8 Define Response Spectrum Function. A response-spectrum function is simply a list of period versus spectral-acceleration

values. In SAP2000, the acceleration values in the function are assumed to be

normalized; that is, the functions themselves are not assumed to have units. Instead, the

units are associated with a scale factor that multiplie

when the response-spectrum analysis case is defined.

A. Click the Define menu > Functions > Response Spectrum Functions command,

which will display Define Response Spectrum Function form (Fig.27).

B. In the Choose th

drop-down list.

C. Click the Add New Function bu

function Definition

form (Fig. 28).

1. In Function

edit box, type RES

IS 1893 II.

2. In Functi

Fig. 27 Define Response Spectrum Functions

Fig. 28 Response Spectrum Function Definition form



Damping Ratio area, type 0.05.

3. In Function File area, click the Browse

button in this area and pick the text file

that includes the response spectrum

data (Refer Appendix). The path of the

selected file will display in the File

Name display box. Click the View File

a, Type 5

graph button, which

8. lick the OK buttons on the Response Spectrum Function Definitions and the

ponse Spectrum Load case

.

hich will display Define Load case data

ea, select Response Spectrum from drop-down list.

F. In Load applied area

1. In Load Type area, select Accel from drop down list.

button to display the selected file in

WordPad.

4. In Header lines to skip are

5. In the Values are: area, select the

Period vs Values option.

6. Click the Display

will display Response spectrum as

shown in Fig. 28. Fig. 29 Response Spectrum Function

Definition form

7. Click the Convert to User Defined button, which will display Response

Spectrum Definition form (Fig. 29).

C

Define Response spectrum functions forms to exit all forms.

Step 9 Define ResA. Click the Define menu > Load Cases command, which will display the Define

Load Cases form

B. Click the Add New Load Case button, w

form (Fig. 30).

C. In Load Case Name Area, Type EQ X. D. In Load Case Type Ar

E. In Modal Combination Area, Select CQC option.



2. In Load Name area, select U1 from drop down list.

3. In Function

area, select RS

IS 1893 II

(Function

defined in step

7) from drop

down list.

4. In Scale factor

edit box, Type

0.2354, i.e.

gRIZ

2.

Fig. 30 Load Cases Data Response Spectrum form

5. Click the Add button

G. Click OK button on the Load Case Data Response Spectrum form to accept the

EQ- X analysis case.

H. Click the Add New Load Case Button on the Define Load Cases form.

I. In Load Case Name Area, Type EQ Y. J. Repeat Item D-E

K. In Load applied area

1. In Load Type area, select Accel from drop down list.

2. In Load Name area, select U2 from drop down list.

3. In Function area, select RS IS 1893 II (Function defined in step 7) from

drop down list.

4. In Scale factor edit box, Type 0.2354 i.e.

gRIZ

2.

5. Click the Add button.

L. Click OK buttons on the Analysis Case Data Response Spectrum form and

Define Load Cases form.



Step 10 Define Mass sources. A. Click the Define menu > Mass Source

command, which will display the Define

mass source form (Fig. 31).

B. In Mass Definition area, select From loads

option.

C. In Define Mass Multiplier for loads area

1. In Load area, Select DEAD from

drop down list.

2. Type 1 in Multiplier edit box.

3. Click the Add button to add mass

source.

4. Repeat Item 1-3 for DEAD Slab,

DEADFig. 31 Define Mass Source

Wall, Dead FF and DEAD RT load.

5. In Load area, Select LIVE from drop down list.

6. Type 0.25 (as live load 3 kN/m2) in Multiplier edit box. D. Click OK button on the Define Mass Source form to accept mass sources.

E. Click the File menu > Save command, or the Save button, to save your

model.

Step 11 Run the Analysis In this Step, the analysis will be run.

A. Click the Analyze menu > Run Analysis command or the Run Analysis

button, to bring up the Set Load Cases to Run form (Fig. 31).

B. Click the Run Now button on the set load cases to run form, which will display

SAP Analysis Monitor (Fig. 32). The program will create the analysis model from

your object-based SAP2000 model. Data will scroll in this window as the

program runs the analysis. This information may be accessed at a later time by

going to the File menu > Show Input/Output Text Files command and selecting

the file with the .LOG extension.



Fig. 32 Set Analysis Cases to Run form

C. When the analysis is finished, the message ANALYSIS COMPLETE will

display. Close the analysis window. The program automatically displays a

deformed shape view of the model, and the model is locked. The model is locked

when the Lock/Unlock Model button appears depressed. Locking the model

prevents any changes to the model that would invalidate the analysis results.

Fig. 33 SAP Analysis Monitor



Step 12 Apply

VBVB Correction

A. Click the Display Menu > Show Tables command, which will display Choose

tables for Display Window (Fig. 34).

B. Check the Structural Output Option.

C. Click OK button on the Choose Tables for Display, which will display tables

Base Reactions and Modal Information.

D. Note Base reactions for DEAD, DEAD SLAB, DEAD WALL, DEAD FF and

DEAD RT, LIVE and LIVE ROOF and compare it with manual load calculations.

E. Also note the Base Shear ( XVB ) in X Direction (Global FX force for EQ X Load

Case) and Base Shear ( YVB ) in Y Direction (Global FY force for EQ Y Load

Case).

F. Calculate Base shear in X direction ( XVB ) and Base shear in Y direction ( YVB )

as per IS 1893: 2002 provisions, and calculate

X

X

VBVB and

Y

Y

VBVB

G. Click the Define menu > Load Cases command, which will display the Analysis

Fig. 34 Choose Tables for Display- Window



Cases form.

H. In Cases area, click the EQ X Case Name and click Modify/Show Case button,

which will display Analysis Case Data- Response Spectrum form.

I. In the load applied area, type the value of

X

X

VBVBXg

RIZ

2in scale factor edit

box and Click OK button on the Analysis Case Data Response Spectrum form.

J. Click the EQ Y Case Name on the Analysis Case Form.

K. Click Modify/Show Case button, which will display Analysis Case Data-

Response Spectrum form.

L. In the load applied area, type the value of

Y

Y

VBVBXg

RIZ

2 in scale factor edit

box and Click OK button on the Analysis Case Data Response Spectrum form.

M. Repeat the step 11 and 12A-12C and Check the base shear in X & Y direction.

Now base shear in X & Y direction should match with base shear in X & Y

direction as per IS 1893:2002 provisions.

Step 13 Define Load Combinations A. Click the Define menu > Combinations command, which will display the Define

Response Combinations form. B. Click the Add New Combo

button, which will display the

Response Combination Data form

(Fig.35). 1. Type 1.5(DL+LL) in the

Response Combination

Name edit box. 2. Select Linear Add from the

Combination Type drop-

down list if it is not already

selected. Fig. 35 Response Combination Data form



3. Select DEAD in the Case Name from drop-down list (if it is not already

selected) and type 1.5 in the Scale Factor edit box (if it is not already

there) and click the Add button. 4. Select DEAD Slab in the Case Name from drop-down list and click the

Add button. 5. Select DEAD Wall in the Case Name from drop-down list and click the

Add button. 6. Select DEAD FF in the Case Name from drop-down list and click the Add

button. 7. Select DEAD RT in the Case Name from drop-down list and click the Add

button. 8. Select Live in the Case Name from drop-down list and click the Add

button. 9. Select Live Roof in the Case Name from drop-down list and click the Add

button. 10. Click OK button on Response Combination Data form to accept

combination. C. Again Click the Add New Combo button to add another load combination, which

will display the Response Combination Data form (Fig.35). 11. Type 1.2(DL+LL+EQX) in the Response Combination Name edit box. 12. Select Linear Add from the Combination Type drop-down list if it is not

already selected. 13. Select DEAD in the Case Name drop-down list and type 1.2 in the Scale

Factor edit box and click the Modify button. 14. Select DEAD Slab in the Case Name drop-down list and type 1.2 in the

Scale Factor edit box and click the Modify button. 15. Select DEAD Wall in the Case Name drop-down list and type 1.2 in the

Scale Factor edit box and click the Modify button. 16. Select DEAD FF in the Case Name drop-down list and type 1.2 in the

Scale Factor edit box and click the Modify button.



17. Select DEAD RT in the Case Name drop-down list and type 1.2 in the

Scale Factor edit box and click the Modify button. 18. Select Live in the Case Name drop-down list and type 0.3 in the Scale

Factor edit box and click the Modify button. 19. Select Live Roof in the Case Name drop-down list and click the Delete

button. 20. Select EQ-X in the Case Name drop-down list and type 1.2 in the Scale

Factor edit box and click the Add button. 21. Click OK button on Response Combination Data form to accept

combination. D. Similarly define following combinations

1. 1.2(DL + LL - EQX)

2. 1.2(DL + LL EQY)

3. 1.5(DL EQX)

4. 1.5(DL EQY)

5. 0.9DL 1.5 EQX

6. 0.9DL 1.5 EQY

Step 14 Graphically Review the Analysis Results. In this Step, the analysis results will be reviewed using graphical representation of the results.

A. Make sure that the X-Y Plane @ Z=0 view is active.

Then click on the XZ View button to reset the

view to an elevation. B. Click the Show Forces/Stresses > Frames/Cables

button or the Display menu > Show

Forces/Stresses > Frames/Cables command to bring

up the Member Force Diagram for Frames (Fig. 35).

1. Select DEAD from the Case / Combo Name drop-down list.

2. Select the Shear 2-2 option. Fig. 36 Member Force Diagram

for Frames form 3. Check the Fill Diagram check box.



Fig.37 Shear Force 2-2 Diagram (DEAD) in an elevation view

4. Click the OK

button to generate

the Shear force

diagram shown in

Fig 37. C. Right click on the any

column in the X-Z

view to bring up the

Diagram for Frame

Object window (Fig.

38). Note that the

program displays the

force diagrams for the

entire column.

1. Select DEAD in Fig. 38 Diagram for Frame Object



the Case drop-down list.

2. Select Major (V2 and M3) in the Item drop-down list. 3. Click the Scroll for Values option and you may obtain the values at any location by

moving the mouse over the diagrams with the left button held down. 4. Click the Done button to close the form.

D. Make sure that the X-Z View is active and

then click the Display menu > Show

Deformed Shape command or the Show

Deformed Shape button, to bring up the Deformed Shape form (Fig. 39). 1. Select MODAL from the Case/Combo

Name drop-down box. 2. Check the Cubic Curve check box. 3. Click the OK button to display first Mode

shape shown in (Fig.40) Fig. 39 Deformed Shape form

Fig.40 Mode Shape in an elevation and 3D views



Click the Start Animation button on the status bar at the

bottom of the screen to animate the first mode shape.

4. Click the Right Arrow button on the status bar at the bottom of the screen to view the next mode shape.

5. Continue clicking the Right Arrow button to step through all of the mode shapes.

6. Click the Left Arrow button on the status bar at the bottom of the screen

to view the previous mode shape.

7. Click the Options menu > Sound command to turn the sound associated with

the animation off or on.

E. Right click on any joint to display the

Joint Displacements results form (Fig.41)

F. Click the Show Undeformed Shape button to remove the displayed mode shape.

Fig. 41 Joint Displacements obtained by right clicking at node

Step 15 Concrete Frame Design In this Step, the concrete frame members will be designed. Note that the analysis should

be run before completing the following Action Items.

A. Click the Design menu >Concrete Frame Design > View/Review Preferences

command. The Concrete Frame Design Preferences form shown in Fig. 42

appears.

a. Click in the Design Code Values drop-down list to see the available design

codes. Select the Indian IS 456-2000 code.

b. Review the information contained in the other items and then click OK to

accept the selections.

B. Click the Design menu > Concrete Frame Design > Select Design

Combinations button, which will show Design Load Combination Selection form

(Fig. 36).

In List of Combination Area, Select all the load combinations defined in Step 13

and click Add.



Fig. 41 Concrete frame design preferences form

C. Click the Design menu > Concrete Frame Design > Start De-sign/Check of

Structure command or the Start Concrete Design/Check of Structure

button, to start the concrete frame design process.

When the design is finished, the area of longitudinal bar required is displayed on

the screen. Note that the current units are KN and m.

D. Click the drop-down list in the status bar to change the units to . The

values for the area of longitudinal reinforcing steel are now in units of mm2.

E. Click the Design menu > Concrete Frame Design > Display Design Info

command to access the Display Concrete Design Results form.

1. Verify that the Design Output option is selected.

2. Select Rebar Percentage from the Design Output drop-down list.



3. Click the OK button. The required longitudinal reinforcing percentage is

displayed on the screen.

F. Right click on any beam/column to access the Concrete Beam /Column Design

Information form.

1. Note that the required top and bottom longitudinal steel and the required

shear steel is reported for each design load combination at each output

segment along the beam.

2. Click the Flex. Details button to display flexural design details for the

highlighted design load combination and output station location. The

Concrete Design Information {Code} form is displayed.

3. When finished viewing the detailed information, click the Close

button in the upper right-hand corner of the Concrete Design Information

{Code} form to close it.

4. Click the OK button to close the Concrete Beam Design Information

form.



APPENDIX

A. Load calculations A.1. Wall load

External wall load intensity

= 0.23 X 1 X (3.1-0.45) X 20

= 12.19kN/m.

Internal wall load intensity

= 0.15 X 1 X (3.1-0.45) X 20

= 7.95kN/m.

Parapet wall load intensity

= 0.23 X 1 X 1.5 X 20

= 6.9kN/m.

A.2. Slab (Self weight) load (Dead Slab)

Intensity of slab load

= 0.15 X 1 X 1 X 25

= 3.75kN/m.

A.3. Floor finish load (Dead FF)

Intensity of floor finish load

= 1 X 1

= 1kN/m.

A.4 Roof treatment load (Dead RT)

Intensity of roof treatment load

= 1.5 X 1 = 1.5kN/m.

A.5. Live load

Intensity of live load

= 3 X 1

= 3kN/m.

A.6. Live roof load

Intensity of live roof load

= 1.5 X 1

= 1.5kN/m.




Table A.1 Load calculations

Load Case

Trapezoidal loading Triangular loading

Dead Slab a = 3.75 X 1.5 = 5.625

Dead FF a = 1.00 X 1.5 = 1.500

Dead RT a = 1.50 X 1.5 = 2.250

Live a = 3.00 X 1.5 = 4.500

Live Roof a = 1.50 X 1.5 = 2.250

B. Response Spectrum text file.

Fig. B.1. Response Spectrum text file.

sap iitr lecture notes

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