两种弹塑性梁单元在桥梁地震响应分析中的研究比较
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摘要
作为抗震结构设计的桥梁,在大中震作用下,按延性构件设计的桥墩通常进入了塑性工作阶段。此时对桥墩弹塑性行为的描述有基于实体的微观模型和基于弹塑性梁单元的宏观模型。在这两大类模型中后者不但概念清晰,分析时间远远低于前者,其结果在某些程度上甚至比前者更准确,目前在土木工程领域的应用也越来越多。本文从两种弹塑性梁单元入手,对某桥进行了全桥动力弹塑性时程分析,并在此基础上提出了一种简单可行的基于纤维截面分析结果的集中铰弹塑性梁单元的定义方法。
For an aseismatic designed bridge, piers, which are designed as ductility parts, will generally enter into plastic stage in a medium or large earthquake. There are two models which can describe the plastic behavior of piers, and they are microcosmic models basing upon entity and macroscopical models grounding on inelastic beam elements. The latter one usually has clearer conception, shorter computing time and better accuracy, so it is more and more used in civil engineering field. In this paper, a inelastic dynamic analysis of some bridge is made, the description of whom began from two inelastic beam elements ,basing on it, a simple and doable defining method of lumped type hinge inelastic beam elements is offered ,this method grounds on the analysis of a fiber section.
For an aseismatic designed bridge, piers, which are designed as ductility parts, will generally enter into plastic stage in a medium or large earthquake. There are two models which can describe the plastic behavior of piers, and they are microcosmic models basing upon entity and macroscopical models grounding on inelastic beam elements. The latter one usually has clearer conception, shorter computing time and better accuracy, so it is more and more used in civil engineering field. In this paper, a inelastic dynamic analysis of some bridge is made, the description of whom began from two inelastic beam elements ,basing on it, a simple and doable defining method of lumped type hinge inelastic beam elements is offered ,this method grounds on the analysis of a fiber section.
引文
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