1) The two pipes below are fixed connected to walls at B and D. Load P has a magnitude of 2
kips. $L = 3$ ft. Segment $BC$ is made of a material with $E = 18,000$ ksi and has an outer diameter
of 3 in and wall thickness of 0.25 in. Segment $CD$ is made of a material with $E = 29,000$ ksi
and has an outer diameter of 4 in and a wall thickness of 0.5 in. Compute the external support
reactions both by hand and using ETABS. Explain why this system is statically indeterminate.
Neglect the self-weight of the pipes.
B
D
P
$\frac{L}{2}$
$\frac{L}{2}$