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UNIVERSITY OF CALIFORNIA, BERKELEY
Instructor: Khalid M. Mosalam
Department of Civil and Environmental Engineering
CE123: Design of RC Structures
Structural Engineering, Mechanics and Material (SEMM)
Spring Semester, 2009
CEE 123 Laboratory Project No. 6 (Solution)
Problem 3.9
f
'’
c
=4000psi
f
y
=60,000psi
a) A
s
=3.81in
2
Æ
f
s
=f
y
Æ
f
’
s
<f
y
Thus, we need to find f
’
s
and to do that we solve the equilibrium of forces equation, which is a quadratic
equation with the unknown being c as follows:
Æ
c=4.72in
Thus,
A
s
=3.811.58*(41/60)=2.73in
2
b) A
s
=5.08in
2
Æ
f
s
=f
y
Æ
f
’
s
<f
y
Thus, we need to find f
’
s
and to do that we solve the equilibrium of forces equation, which is a quadratic
equation with the unknown being c as follows:
Æ
c=6.27in
Thus,
A
s
=5.081.58*(52/60)=3.71in
2
c) A
s
=6.00in
2
Æ
f
s
=f
y
Æ
f
’
s
<f
y
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Instructor: Khalid M. Mosalam
Department of Civil and Environmental Engineering
CE123: Design of RC Structures
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This note was uploaded on 02/27/2011 for the course CE 123 taught by Professor Mosalam during the Spring '09 term at University of California, Berkeley.
 Spring '09
 Mosalam
 Structural Engineering, Environmental Engineering

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