Analysis and Design of 4 Story Steel Building Frame

ETABS Version 8.5.5

Lecture 2

Structure to be analyzed and design:

The data of the structure are in the upcoming slides.

Problem:

• All columns fixed at their bases.

• Floor height is 3m.

• Other dimensions are as shown in the plan.

• Loads from the partition, floors are considered.

• Perform an optimized design.

• Report the optimized sections as your result.

• Report how many members fail stress check.

Member Section mm

Beam Chosen appropriately by the software

Column Chosen appropriately by the software

Sectional dimensions:

PLAN

444444444444444$

$4 stories

4 stories

5 m

5 m

$44$4 stories 4 stories

Type of the Load Value

Distributed Load due to wallsExterior Walls

15 kN/m

Interior walls 8 kN/m

Live Load on floors 2 kN/m2

Loading on the structure:

Select the units

Select the grid

Give the details for

grid as shown

Then Press ok

Defining sections:In order to draw beams and columns, we have to import sections.Go toDefineSection PropertiesImport I/Wide Flange

Select ISMB (100 to 300) sections and press ok

Now select Add Auto select List

Creation of auto selection list

Select OK to create auto selection list

Select all beams using shift key and then press add

Write the name

Select similar stories here

Go to Plan view to draw beams & columns

Select beam List here

Modeling of the structure:

Create dummy floors to apply loads Use this tool to draw the areas

Select None here

Final Model of the structure:

Defining Load cases:

Go to DefineStatic Load casesType Wall(Load) Select(Super Dead)

Add New Load CaseOk

Select the beams(Exterior) you want to apply distributes load: Go to AssignFrame/Line LoadsDistributed

Select wall here Select direction

Give the value of Load Similarly repeat the same process for interior partition walls

Select all the areas to apply Live Load

Select Live here Type value as 2 Select units properly

Fixing the supports:

Go to Base view Select the joints you want to apply the foundation reaction

Go to Assign(Menu)Joint/pointPoint SpringsGive the values from the foundations table

Go to Analyze menu to run the analysis

Go to Display Menu to see different Analysis results like reactions(support),Bending moment diagram e.t.c

Go toDesignSteel Frame DesignStart Design/check of structure

Analysis and design sections differ, so please select NO to continue the optimized design process.

The members which failed in capacity check must be reassigned. Select YES to select them.

The members capacities are shown by different colors.Un lock the model to reassign the selected members.

Member in red color are in critical condition

Go to AssignFrame LineFrame sectionImport sections upto ISMB 600 and assign ISMB600.

Re run analysis and design. Verify whether all members passed or not. If some members still exceed capacity repeat the process explained above to reach safe design.

If the imported sections are not sufficient to meet your capacity requirement you have to create a section and assign it.

For creating a section Go to

Add I/wide flange section and give suitable dimensions to meet your requirement.

And repeat the same process to reach safe design.

Details of the built Beam:

Right click on any member to view member wise results. The circled part shows the analysis and design sections. I have created a built beam to satisfy capacity requirement.

Thank you