Civil Engineering MCQAE Level Civil Engineering
A rigid plate rests on three equal-length parallel bars: two copper bars (A=200 mm², E=100 GPa each) at the sides and one steel bar (A=100 mm², E=200 GPa) in the middle. An axial load of 100 kN is applied. Load on steel bar:
Strength of MaterialsStatically Indeterminate BarHARD
Choose the correct answer
A
25 kN
B
33.3 kN
C
50 kN
D
66.7 kN
Correct Answer
B. 33.3 kN
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k_steel = 200,000×100/L; k_copper(each) = 100,000×200/L — all equal. P_steel = (k_s/3k_s)×100 = 33.3 kN
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