不同墩高下连续刚构桥抗震性能分析

Seismic Performance Analysis of Continuous Rigid Frame Bridges at Different Pier Heights

以某大跨连续高墩刚构桥为依托,采用Midas/civil软件建立仿真模型,通过时程分析方法研究双肢薄壁墩参数在地震响应下对高墩连续刚构桥抗震性能的影响。以桥墩高度为主要参数,以模型阵型频率、桥墩墩顶、墩底位移及内力变化三个方面对其抗震性能进行评价。研究结果表明,随着其中一个桥墩高度的增加,桥梁频率不断减小,矮墩墩底及矮墩主梁根部出现内力最大值。随墩高的增加,矮墩内力越来越大,高墩内力逐渐减小。

Based on a long-span continuous high pier rigid frame bridge,Midas/civil software is used to establish a simulation model,and studies the influence of parameters of double leg thin-walled piers on the seismic performance of the continuous high pier rigid frame bridge under the seismic response by the time history analysis method.Taking the height of the pier as the main parameter,the seismic performance of the model is evaluated from three aspects:the frequency of the model formation,the displacement of the top and bottom of the pier,and the change of the internal force.The results show that,with the increase of the height of one of the piers,the frequency of the bridge formation decreases continuously,and the extreme value of the internal force mainly appears at the root of the main beam and the bottom of the short pier.With the increase of pier height,the internal force of short pier becomes larger and larger,and the internal force of the high pier decreases gradually.