final presentation for ce 331 introduction to structural engineering
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Final Presentation for CE 331 Introduction to Structural Engineering. Visit a construction site. Photograph structural components, copy structural drawings. Calculate structural adequacy. Your Assignment for Project 2 was to:. P u. P n. Create an interesting presentation that:. - PowerPoint PPT PresentationTRANSCRIPT
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
Calculate structural adequacy
Describes your structure
Summarizes your structural analysis
Create an interesting presentation that:
n
u
P
PUC
Pu
Pn
The following slides are examples.Feel free to use copy and paste any sketches into your own presentation.
Gravity Load Analysis for Sears
Tower
for
CE 331, Spring 2007
Project 2
byMatt Damon andJennifer Lopez
The Sears Tower is a 108-story steel-frame office building in downtown Chicago Illinois.
(Original) Owner: Sears & 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 column and spread footing.
Elevation View
- steel tube column
- reinforced concrete foundation
- steel roof deck- bar joist
- joist girder
Roof dead load = 14 psf
waterproof membrane 4 psf
steel deck 4 psf
purlins 3 psf
suspended ceiling 2 psf
sprinklers 1 psf
14 psf
Section of Roof
We checked the design of an interior column for axial buckling.
Pu
Pn
Column live load = 15 psf
Specified live load = 20 psf
Interior Column
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 = [ 1.2 (14psf) + 1.6 (15psf) ] (30ft)(25ft) = 30.6k
Pu
Column capacity (Pn) = 44k
failure mode: axial buckling
grade 50 steel E = 29,000ksi
fy = 50ksi
slenderness (kLu/r) r = 23.4in
k = 1.0
Lu = 10.5ft
AISC Table Pn = 44k
HSS 3x4x3/16
Design check shows column design is OK
82.0)44)(85.0(
6.30
k
k
n
u
P
PUC
Pu
Pn
We checked the design of a typical reinforced concrete spread footing for flexure failure.
Flexure failure occurs when demand (Mu) exceeds capacity ( Mn).
location of flexure failure
factored soil pressure, qu
Pu, factored axial force from column
qu
C
T
Mn Mu