[ANSWERED] 1. For the plane truss shown in Figure P15–4, bar element 1 is subjected to a uniform temperature…

1. For the plane truss shown in Figure P15–4, bar element 1
is subjected to a uniform temperature rise of 30 F. Let E = 30
10
6
psi, A = 2 in
2
, and a = 7:0
10
-6
(in./in.)/ F. The
lengths of the truss elements are shown in the figure. Determine the stresses
in each bar. (Hint: Use Problem 3.21 for (K .)
2. For the structure shown in Figure P15–5, bar element 1 is
subjected to a uniform temperature rise of T = 20 C. Let E = 210 GPa, A ¼=2
10
-2
m
2
, and a = 12
10
-6
(mm/mm)/
C. Determine the stresses in each bar.