CEE 379 Problem Set 4 Autumn 2007
(Due in-class, Oct. 19th)
You can work in groups of 2-4 to complete this assignment. Turn in only one assignment
per group. Write the names of all members of the group on this sheet.
Names: 1.
2.
3.
4.
In all problems, consider a truss member a cross-sectional area, A = 10.0 in2, a modulus
of elasticity, E=29 x 103 ksi, and a yield stress of 50 ksi (with no strain hardening). The
nodal coordinates of the member are as follows:
X
N = 10 in. YN = 0. in.
X
F = 10 in. YF = 150 in.
Problem 1. Compute the element stiffness matrix for this member.
L =
AE/L =
cos θx =
sin θx = cos θy
k (4x4 matrix) =
[
