PSAD Refresher 51: Axial Stress of Rod Attached to Unyielding Walls

SITUATION 1: In figure A, the homogeneous rod of constant cross section is attached to unyielding supports. In figure B, a homogeneous bar with a cross-sectional area of 600 mm2 is attached to rigid supports. The bar carries the axial loads P1 = 20 kN and P2 = 60 kN, as shown.
1. In figure A, which of the following calculates the reaction R1.
A. Pab/L^2 C. Pa/L
B. P(b/L)^2 D. Pb/L
2. In figure B, calculate the reaction (kN) at A.
A. 46.67 C. 45.56
B. 33.33 D. 35.56
3. In figure B, calculate the maximum axial stress (MPa) in the rod.
A. 74 C. 59
B. 26 D. 86
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