# Presentation Assignment

```Final Presentation
for
CE 331 Introduction to Structural Engineering
Your Assignment for Project 2 was to:
Visit a construction site
Photograph structural components,
copy structural drawings
Create an interesting presentation that:
Pu
Pn
UC 
Pu
 Pn
The following slides are examples.
Feel free to use copy and paste any
Analysis for Sears
Tower
by
Matt Damon and
Jennifer Lopez
for
CE 331, Spring
2007
Project 2
The Sears Tower is a 108-story steel-frame
office building in downtown Chicago Illinois.
(Original) Owner: Sears &amp; Roebuck Co.
Contractor: Morse-Diesel Inc.
Structural Engineer: Skidmore, Owings,
and Merrill
The Sears Tower is constructed of nine
steel “tubes”, each 75 feet across.
Insert several slides using your own photos here.
We analyzed a typical interior
- steel roof deck
- bar joist
- joist girder
- steel tube column
- reinforced concrete foundation
Elevation View
Section of Roof
waterproof membrane
4 psf
steel deck
4 psf
purlins
3 psf
suspended ceiling
2 psf
sprinklers
1 psf
14 psf
We checked the design of an interior
column for axial buckling.
Pu
 Pn
Column live load = 15 psf
Interior Column
Specified live load = 20 psf
Column live load = 15 psf
specified live load = 20 psf
tributary area = 525 sf
live load reduction factor = 0.75
reduced live load = 15 psf
Factored load to column (Pu) = 30.6k
Pu
Pu = [ 1.2 (14psf) + 1.6 (15psf) ] (30ft)(25ft) = 30.6k
Column capacity (Pn) = 44k
failure mode:
axial buckling
E = 29,000ksi
fy = 50ksi
HSS 3x4x3/16
slenderness (kLu/r)
r = 23.4in
k = 1.0
Lu = 10.5ft
AISC Table
Pn = 44k
Design check shows column design is OK
Pu
 Pn
Pu
30.6k
UC 

 0.82
k
 Pn (0.85)(44 )
We checked the design of a typical reinforced
concrete spread footing for flexure failure.
Flexure failure occurs when demand (Mu)
exceeds capacity ( Mn).
Pu, factored axial force from column
location of flexure failure
factored soil pressure, qu
C
T
qu
Mn
Mu
```