简化的混合试验在桥梁抗震中的应用

Application of Simplified Hybrid Experiment in Bridge Seismic Resistance

由于地震荷载的不确定性,桥梁结构在地震作用下的响应也各不相同。要全面的对桥梁进行性能评价以及后续的加固措施比较困难。本文以一座三跨变截面连续梁桥为例,评价在罕遇地震下桥梁的破坏形态,为其加固提供理论指导。本文采用Midas civil建立桥梁的三维结构模型,采用弹塑性时程分析得到墩柱顶部水平力较大。为了较详细的分析墩柱的受力情况,采用了有限元与实验结合的方法,将水平力的时程函数作为实验输入的节点动力荷载,研究桥梁破坏特性。最后通过土木工程非线性有限元软件FEA建立墩柱的实体模型与实验做对比。结果表明,这种方法能够充分反应桥梁在地震作用下的破坏形态,并且能够提高工作效率。

Due to the uncertainty of seismic load, the responses of bridge structures in seismic load are different. The comprehensive evaluation about the performance of bridge and the follow-up of reinforcement measures are more difficult. Taking a three span continuous beam bridge as an example, the failure modes of the bridge under rare earthquake load are evaluated, in order to provide theoretical guidance for the reinforcement of the bridge. In this paper, Midas civil is used to establish the three-dimensional structure model of the bridge, and the elastic-plastic time history analysis method is used to obtain the large horizontal force at the top of the pier column. In order to analyze the stress of the pier column in detail, the hybrid experiment method is used. The time history function of the horizontal force is used as the node dynamic load of the experiment to study the failure characteristics of the bridge. Finally, the solid model of the pier column is built by the nonlinear finite element software FEA in civil engineering. The results reflect that the method can show the failure mode of the bridge under earthquake and improve the efficiency of the work.