[问答题]请说明力矩分配法的物理概念。

参考答案：

先在刚结点B加上阻止转动的约束，把连续梁分为单跨梁，求出杆端产生的固端弯矩。结点B各杆固端弯矩之和即为约束力矩MB。去掉约束（即相当于在结点B新加－MB），求出各杆B端新产生的分配力矩和远端新产生的传递力矩。叠加各杆端记下的力矩就得到实际杆端弯矩。

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