Exam1Soln
ColumnDesign,PretensionedBeams
CE437/537,Spring2011
1.ColumnDesign
a.Isthecolumnslender?
1/4
Conc. Dimensions:
b
h
14
14
Slenderness:
k
Lu
r
k Lu / r
in
in
Braced Frame
max_kLu/r
neglect slenderness
1.0
10.5
4.20
30.0
TRUE
28.0
NG
ft
in
= 64 - 5
Two-Span Post-Tensioned Beam HW_8_Postensioned_Beam.xlsm
span frame_spacing 60 30 ft ft Column f'c_col E_col 6 4,415 ksi b h A I A*y_bar 8,064 20,088 28,152 28 28 784 51,221 Ix 32,256 2,232 in in in^2 in^4 d 7.88 7.12
1/2
Beam f'c beta_1 unit_wt E_beam b_
Column Design (non-slender columns only)
for rectangular, tied columns with symmetric reinforcement
Design Loads Pu, k Mu, k-ft LC I 130 240 LC II
Material Properties 3000 psi f'c fy 60000 psi
Line 1 2 3 4 5 6 7 8
Reinforcement Detail # of Bars Bar Size d
Column Design (non-slender columns only)
for rectangular, tied columns with symmetric reinforcement
Design Loads
Pu, k Mu, k-ft
LC I
710
50
LC II
Line
1
2
3
4
5
6
7
8
Material Properties
3000 psi
f'c
fy
60000 psi
Reinforcement Detail
# of Bars Bar Size d
Column Design (non-slender columns only)
for rectangular, tied columns with symmetric reinforcement
Design Loads
Pu, k Mu, k-ft
LC I
390
220
LC II
Line
1
2
3
4
5
6
7
8
Material Properties
3000 psi
f'c
fy
60000 psi
Reinforcement Detail
# of Bars Bar Size d
HW 4.1: Column Interaction Diagram-1 Point at a Time
Mat'l Props and Dimensions:
f'c
3
ksi
beta_1
0.85
_con
150
pcf
b
h
18
18
in
in
top line
mid line
bot line
bot surface
60
bar size
9
9
9
ksi
n_bars
3
2
3
1.5
3
0.375
in^2
fy
clear_cover
tie_size
d_tie
in
CE537,Spring2011
Exam2
keep 3 significant figures in your calculations
1/1
1. Design a two-span post-tensioned beam for a multi-story office building.
normal weight concrete
f'c of beam = 4 ksi
f'c of columns = 5 ksi
span = 55 ft
frame spacing = 35 ft
sto
CE 537, Spring 2006
Exam 2
Prestressed Beam Design
A spreadsheet may be used to perform some or all calculations. Spreadsheets should be e-mailed to me at
the time the test is due. Calculations performed entirely by the spreadsheet (no typical hand-calcul