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位移法为什么2i和4i一个在上一个在下

2025-03-15 10:50:09

推荐回答（1个）

回答1：

第一图：两根横梁杆属于都一端固定一端简支梁，当固定端产生单位转角时，固定端弯矩=3i,所以两杆为6i.如不懂再看看形常数定义。
第二图：相当于一端固定一端简支梁，固定端向下产生单位位移，弯矩使杆件下部受拉，所以画在下部。也属于形常数问题。

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