Q6. The frame is made from pin-connected members, and is supported by pins at point A and C. The frame is subjected to a uniformly distributed load with load
intensity w = 209 lb/ft, and the lengths are 11 = 3.0 ft and 12 = 5.1 ft. The horizontal
member AB is a hollow square pipe, and it has the cross section as shown, with outer
dimension do - 2.2 in, and inner dimension d; = 1.7 in. Determine the magnitude of
maximum bending stress at point D, in the unit of ksi.
W
k do
D
B
di
1.5 ft
A
E
4 ft
2.5 ft
11
12