Structures Specialization Book

Elena Arca

ARE 320L – Spring 2016

Pafge;alishef13

Table of Contents

Building 1

Loads and floor plan3

Excel spreadsheet for gravity analysis4

Axial loads and moment diagrams5

SAP beam and girder design6

Moment and shear diagrams7, 8

Building 2

Loads and floor plan9

Axial loads and moment diagrams10

SAP beam and girder design11

Moment and shear diagrams12, 13

Comparisons and Conclusions14

Resources Used

AISC Steel Construction Manual, 13th edition

IBC 2012 Loads

Load Deflection Tables, AISC ASD 8th edition

Preliminary Beam Design Equations (deflection, moment,

etc.)

SAP Analysis Procedure

· Create grid lines for the given floor plan

· Draw beams, girders, and columns onto the grid and copy to selected heights

· Apply dead and live loads to allocated areas and copy to selected heights

· Run analysis to view moment, shear, axial forces/diagrams

· Design steel members until there are no inconsistencies within the structure

Assumptions

· Simply supported

· Building 1: one way distribution

· Building 2: two way distribution

· Connected to the ground by pins (eliminates moment at anchor)

· Released joint restraint (eliminates moment in the joints)

Live load

Dead load

Gym

100

30

Library

150

30

Corridor

100

30

Classroom

40

30

Interior Beam Gym

length (ft)

tributary width (ft)

linear load (kip/lf)

Mmax (k-ft)

25

10

1.96

153.125

section choice

Mp (kip-ft)

I (in^4)

deflection (in)

W18x35

249

510

1.164743915

Interior Girder Gym/Library

length (ft)

load at center (kips)

Mmax (k-ft)

Vmax (kips)

20

59

295

29.5

section choice

Mp (k-ft)

I (in^4)

deflection (in)

W21x44

358

843

0.695054608

Exterior Girder Gym

length (ft)

load at center (kips)

Mmax (k-ft)

Vmax (kips)

20

24.5

122.5

12.25

section choice

Mp (k-ft)

I (in^4)

deflection (in)

W14x26

151

245

0.993103448

Exterior Beam Gym

length (ft)

tributary width (ft)

linear load (kip/lf)

Mmax (k-ft)

25

5

0.98

76.5625

section choice

Mp (kip-ft)

I (in^4)

deflection (in)

W14x26

151

245

1.212284483

Axial loads

Moment diagrams

SAP beam and girder design

Exterior beam – moment and shear diagrams

Exterior girder – moment and shear diagrams

Interior beam – moment and shear diagrams

Interior girder – moment and shear diagrams

Dead load

Live load

Manufacturing

30

250

Office

30

50

Corridor

30

80

Storage

30

125

Axial loads

Moment diagrams

SAP beam and girder design

Exterior beam – moment and shear diagrams

Exterior girder – moment and shear diagrams

Interior beam – moment and shear diagrams

Interior girder – moment and shear diagrams

Comparisons (SAP vs. Excel)

· Interior Beam: SAP - W14x48 ; Excel - W18x35

· Interior Girder: SAP - W21x48; Excel - W21x44

· Exterior Beam: SAP - W14x38; Excel - W14x26

· Exterior Girder: SAP - W12x30 ; Excel - W14x26

Conclusions

Recommended member sizes differ slightly between SAP and Excel. Members are similar because the information used to size them is generally the same, but SAP has the capacity to take more than the deflection, tributary area, and point loads into account. Both methods make the structural sizing process much faster.