等效长度的概念具有了明确的物理含义，且几个基本模型在理论基础上达到一致。

And then, the so_called equivalent length is redefined by using the basic concept of modeling of strain localization.

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结果表明，对于等效长度直杆，动力失稳临界压力要远大于静力失稳的临界压力。

The result indicates that the critical load of dynamic instability is far more than that of static instability with regard to the equivalent length bars.

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此外，还讨论了加载过程中钢筋混凝土刚架杆端塑性饺的性能，给出了计算等效塑性铰长度的经验公式。

Besides, the behaviour of plastic hinge at the member end of RC frame in process of loading is discussed and the empirical formula for calculating the equivalent length of plastic hinge is also given.

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