罕遇地震下连续梁桥弹塑性动力时程反应分析
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摘要
在罕遇地震下连续梁桥的墩柱会进入塑性工作状态,采用弹塑性纤维单元模拟墩柱的弹塑性力学性能。通过合理设置弹塑性纤维单元的位置,计算等效塑性铰长度,进行罕遇地震下连续梁桥的弹塑性动力时程反应分析。研究结果表明,使用弹塑性纤维单元,可以模拟罕遇地震作用下连续梁桥的墩柱结构由弹性阶段进入塑性阶段的变化过程,得到罕遇地震作用下连续梁桥的地震响应需求,为准确地评估罕遇地震下桥梁结构的工作性能,合理地进行桥梁结构的抗震设计提供必要的前提和基础。
Continuous girder bridge piers will enter the plastic working condition under rarely strong earthquake. The elastic-plastic fiber element is used to simulate elastic-plastic mechanics performance of piers. According to the reasonably set position of elastic-plastic fiber element, the equivalent plastic hinge length is calculated and the elastic-plastic dynamic time-history response analysis of continuous girder bridge under rarely strong earthquake is conducted. The research results show that the use of elastic-plastic fiber element can simulate the change process of continuous girder bridge piers from the elastic state to the plastic state under rarely strong earthquake. The seismic response demand of continuous girder bridge under rarely strong earthquake can be acquired, which provides necessary premise and foundation for the accurate assessment of the bridge structure working performance and the reasonable seismic design of bridge structure under rarely strong earthquake.
引文
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