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15问答网 > 求图中A，B的支座反力。怎么求？如何把力偶矩转化成力的形式？

求图中A，B的支座反力。怎么求？如何把力偶矩转化成力的形式？

2025-03-16 02:25:04

推荐回答（1个）

回答1：

求支反力时，取梁整体为受力分析对象：
无须（且不能）将力偶转换为力
ΣMA =0， RB.L +Mc -qL.L/2 =0
RB.L +qL^2/4 -qL.L/2 =0
RB =qL/4（向上）
.
ΣFy =0, RAy +RB -qL =0
RAy +qL/4 -qL =0
RAy = qL(3/4)（向上） ①
无X方向荷载，RAx =0
.
验算RAy:
ΣMB =0, -RAy.L +Mc + +qL.L/2 =0
-RAy.L +qL^2/4 +qL.L/2 =0
RAy = qL(3/4)（向上） ,结果与①相同

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