普尔隆澜沧江桥梁抗震设计的设防标准探析

Analysis on Fortification Standard for Seismic Design of Lancang River Bridge in Pulong

以普尔隆澜沧江大桥工程为例,通过对桥梁抗震设防标准的了解,提出不同桥梁抗震设计规范的桥墩动水附加质量计算方法,建立有限元模型,进行直观分析,确定地震动力参数,采用反应谱法研究结构在不同地震作用下的反应特性,明确了E1、E2两种设防标准地震作用下的桥梁主墩的抗震性能,并对两者进行了分析,评价主墩的抗震性能。研究表明,桥梁墩柱的抗震性能良好,达到抗震设计要求。

Taking Lancang River Bridge project in Pulong as an example,based on the understanding ofthe seismic fortification standards of bridges,the calculation method of dynamic water additional mass of piers with different seismic design specifications is proposed,finite element model is established,and the seismic dynamic parameters are determined by intuitive analysis.The response spectrum method is used to study the response characteristics of structures under different earthquakes.The seismic performance of the main pier of the bridge under two kinds of fortification level earthquake input E1 and E2 is defined,and the two are analyzed to evaluate the seismic performance ofthe main pier.The research shows that the seismic performance ofbridge piers and columns is good and meets the seismic design requirements.