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首页> 外文期刊>Journal of bridge engineering >Collapse Failure of Prestressed Concrete Continuous Rigid-Frame Bridge under Strong Earthquake Excitation: Testing and Simulation
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Collapse Failure of Prestressed Concrete Continuous Rigid-Frame Bridge under Strong Earthquake Excitation: Testing and Simulation

机译：地震作用下预应力混凝土连续刚构桥的倒塌破坏：试验与仿真

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摘要

In recent years, increasing attention has been paid to the collapse failures of long-span continuous rigid-frame bridges under strong earthquake excitations. This paper presents the results of a study in which a 1:15 scaled two-span prestressed concrete continuous rigid-frame bridge model with box-type piers was tested using the shake-table array test system to investigate the seismic response characteristics. Two nonlinear finite-element (FE) models were constructed. The first was a single-girder model that was used to simulate the seismic response under weak seismic waves. The second was an explicit dynamic FE model that was used to simulate the collapse and failure mechanisms of the scaled bridge under strong earthquakes. Testing revealed that the response of the central pier of the prestressed concrete continuous rigid-frame bridge was the largest under seismic excitation, and the damage first appeared at the lower end of the central pier in all cases. The numerical simulations revealed that traveling wave effects have a beneficial effect on the displacement at the top of all piers. The explicit dynamic model was able to predict the failure modes and collapse process of the scaled bridge model. The plastic hinges emerging at the ends of the piers were considered the main failure modes, and the collapse process changed with different seismic wave excitations. Such tests and analyses can provide useful reference for the seismic-strengthening and anticollapse design of prestressed concrete continuous rigid-frame bridges with a long span.
机译：近年来，在强烈地震激励下，大跨度连续刚构桥的倒塌破坏越来越引起人们的重视。本文介绍了一项研究结果，其中使用振动台阵列测试系统测试了1:15比例的两跨预应力混凝土连续刚构桥模型的箱形墩，以研究地震响应特性。构造了两个非线性有限元（FE）模型。第一个是单梁模型，用于模拟弱地震波下的地震响应。第二个是显式动态有限元模型，用于模拟强地震作用下伸缩桥的倒塌和破坏机理。测试表明，在地震激励下，预应力混凝土连续刚构桥中心墩的响应最大，在所有情况下，损伤首先出现在中心墩的下端。数值模拟表明，行波效应对所有桥墩顶部的位移都有有益的影响。显式动力学模型能够预测伸缩桥模型的破坏模式和坍塌过程。桥墩末端出现的塑料铰链被认为是主要的破坏模式，并且坍塌过程随着地震波激励的不同而改变。这些测试和分析可为大跨径预应力混凝土连续刚构桥的抗震加固和抗倒塌设计提供有益的参考。

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