University of California, Berkeley
Dept. of Civil and Environmental Engineering
Spring Semester 2009
1
CE 121 — Advanced Structural Analysis
Homework Set #7 (due Mar. 20, 2009)
1. Problem (5 points)
The truss model in the following figure is the same as the model used in Examples 1 and 8 of the
CE121 class notes. Thus, you are welcome to use the equilibrium and compatibility equations
directly without rederiving them.
All truss elements have the same axial stiffness of EA=10,000 units.
Complete the following tasks:
1.
Determine the basic element forces for the two applied forces separately. What do you
observe about the force values for each load case? (note the symmetry in geometry of the
truss model).
2.
Determine the element deformations of the truss elements for each load case separately.
3.
Determine the horizontal translation of node 4 and the vertical translation of node 2 for
each load case separately. What do you observe?
4.
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 Fall '09
 filippou
 Civil Engineering, Force, Structural Engineering, Environmental Engineering, Truss, Dept. of Civil and Environmental Engineering

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