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【Daily Question】【Civil Engineering Version 20180606】

2018-06-07View Original

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A simply supported beam AB is subjected to loads as shown in the figure. Let RA and RB represent the reaction forces at supports A and B respectively; then their relationship is ( ). A. RA RB C. RA = RB D. Cannot be compared Answer: C 【Explanation】The condition for equilibrium of a planar couple system is that the algebraic sum of all the couples in the system is equal to zero. Therefore, in order to counteract the effect of the torque M, a pair of couples will exist at supports A and B. Then RA = RB.

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