1
UNIVERSITY OF CALIFORNIA, BERKELEY
Dept. of Civil and Environmental Engineering
Spring Semester 200
9
CE 121 – Advanced Structural Analysis
Homework Set #2 (due Feb.
6
, 200
9
)
1.
Problem (
10
points)
10
10
10
5
12
15
1
2
3
4
5
a
b
c
d
1
2
3
4
5
a
b
c
d
2.5
The two span beam in the figure is to be analyzed for two loading conditions, as shown.
1.
Number the global degrees of freedom (dof) in the most complete way without accounting
for the axial dof's, which are obviously not relevant for this loading.
2.
Set up the equilibrium equations in terms of the element forces
Q
and the applied forces at
free dofs
f
P
, i.e.
f
f
=
B
P
Q
for the first loading case.
3.
Remove trivial equations from the equilibrium equations in question (2) and renumber free
dofs and basic forces accordingly.
4.
Solve for the unknown basic element forces
Q
. Then use the equilibrium equations at the
restrained dofs
to determine the support reactions
R
and check global equilibrium.
5.
Draw the shear and bending moment diagram.
6.
Repeat questions #4 and #5 above for the second load case, and draw the shear and bending
moment diagram for this load case as well. Determine support reactions and check global
equilibrium.
Determine the maximum bending moment
.
NOTE
: no units are specified for either problem. It is assumed that all values are in consistent
units, i.e. kip and ft for the U.S. system and kN and m for SI.

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