1. A rigid beam AD shown below is supported by three steel bars (E = 30× 10°ksi, and a = 7.2 x 10-6/°F) and a pin at D. The three cross-sectional areas of the bars are: A1 1.2 in?, A2 = 1.5 in², and A3 %3D 1.8 in?. The length of the bars are L1 = 40 in, L2 = 50 in, and L3 = 30 in. The dimensions a and b are: a = 30 in and b = 60 in. The beam AD was horizontal before a load P = 100 kip was applied downward at point A and the temperature of the three bars was decreased by 50°F. Determine the rotation angle 0 and stress in all three bars. L2 |(2) (1) "Rigid" O A B. a L3 |(3)
1. A rigid beam AD shown below is supported by three steel bars (E = 30× 10°ksi, and a = 7.2 x 10-6/°F) and a pin at D. The three cross-sectional areas of the bars are: A1 1.2 in?, A2 = 1.5 in², and A3 %3D 1.8 in?. The length of the bars are L1 = 40 in, L2 = 50 in, and L3 = 30 in. The dimensions a and b are: a = 30 in and b = 60 in. The beam AD was horizontal before a load P = 100 kip was applied downward at point A and the temperature of the three bars was decreased by 50°F. Determine the rotation angle 0 and stress in all three bars. L2 |(2) (1) "Rigid" O A B. a L3 |(3)
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:1. A rigid beam AD shown below is supported by three steel bars (E = 30× 10°ksi, and a =
7.2 x 10-6/°F) and a pin at D. The three cross-sectional areas of the bars are: A1 =
1.2 in?, A2
1.5 in?, and A3
1.8 in?. The length of the bars are L1
40 in,
%3D
L2 = 50 in, and L3 = 30 in. The dimensions a and b are: a = 30 in and b = 60 in. The
beam AD was horizontal before a load P = 100 kip was applied downward at point A
and the temperature of the three bars was decreased by 50°F. Determine the rotation
angle 0 and stress in all three bars.
L2
|(2)
|(1)
-"Rigid"
В
L3
E a -
(3)
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