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
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
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
Thus, we need to find f
This is the end of the preview.
Sign up
to
access the rest of the document.
 Spring '09
 Mosalam
 Civil Engineering, Structural Engineering, Environmental Engineering, Quadratic equation, BERKELEY Department of Civil and Environmental Engineering Structural Engineering, Khalid M. Mosalam

Click to edit the document details