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191问答库 > 结构力学。为什么一个单铰相当于两个约束？

结构力学。为什么一个单铰相当于两个约束？

2025-03-16 23:30:23

推荐回答（3个）

回答1：

在平面内，刚体有三个自由度，X方向平动、Y方向平动、面内的转动。单铰约束住了X、Y方向的平动，刚体只能发生面内转动。因此单铰就相当于两个约束。基本概念而已，神人免谈。

回答2：

你想象一个咬左右各一个梁就稳定了，需要两个约束才稳定。

回答3：

这么基本的东西

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