基于阻尼参数的高速铁路连续梁桥地震损伤概率影响分析

为研究阻尼参数对高速铁路连续梁桥地震易损性的影响,以一座(32+48+32) m高速铁路连续梁桥为研究背景,借助大型开源程序Open Sees建立了数值模型,并应用基于可靠度理论的概率解析易损性函数表达式获得地震易损性曲线(面),探讨阻尼器参数对桥梁地震易损性的影响。研究结果表明:(1)设置阻尼器使桥梁受力更为合理,可进一步提高桥梁抗震性能;(2)阻尼系数的提高及阻尼指数的降低均使得桥梁固定墩曲率及活动支座位移减小,进而降低固定墩和活动支座在地震作用下的损伤概率。

Numerical Investigation of Effects of Damper Parameters on Probabilistic Seismic Vulnerability of High-speed Railway Continuous Beam Bridge

In this paper,the effects of damper parameters on the seismic vulnerability of high-speed railway bridge are examined with a finite element software OpenSees with reference to a continuous girder bridge of( 32 + 48 + 32) m span. The curve of seismic vulnerability is obtained from the function of probability analytical vulnerability based on reliability theory,and the effects of damper parameters on the seismic vulnerability of High-speed Railway bridge are discussed. The numerical results show that:( 1)setting damper makes the stress distributions of the bridge more reasonable,which further improves the seismic performance of bridge;( 2) the increase of damper coefficient and the decrease of damper index reduce the curvature of the fixed pier and the displacement of the movable bearing,which further reduce the damage probability of the fixed pier and the movable bearing under earthquake action.