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本文分析了含两个对称缺陷的固支梁在阶跃载荷作用下的刚塑性动力响应,给出了不同载荷幅值区段的响应模式,求得了完全解,指出在结构参数和缺陷参数与外载之间存在着比较复杂的关系。表现在结构的响应模式高达十几种。它们可能是双自由度的三铰(整体五铰)模式,也可能是单自由度的双铰(整体三铰)模式。但是当载荷幅值很高时,都会出现一种固定的三铰模式。另一方面,在缺陷处通常存在一个塑性铰,这种现象反映了缺陷造成的应变集中效应。
In this paper, the rigid-plastic dynamic response of a fixed-supported beam with two symmetric defects under step load is analyzed. The response modes of different load amplitude sections are given and the complete solution is obtained. The structural parameters and defect parameters are pointed out There is a more complicated relationship between them. There are more than a dozen response patterns in the structure. They may be a two-degree-of-freedom, three-hinge (holistic five-joint) mode, or a single-degree-of-freedom, double-hinge (holistic three-joint) mode. However, when the load amplitude is high, there will be a fixed three-hinge mode. On the other hand, there is usually a plastic hinge at the defect, which reflects the strain concentration effect caused by the defect.