不同结构形式的高墩连续刚构桥地震响应规律对比及易损性分析  

Comparison of Seismic Response and Vulnerability Analysis of High Pier Continuous Rigid Frame Bridges with Different Structural Forms

作　　者：吴琼 张荣彪 向敏 郭进 Wu Qiong;Zhang Rongbiao;Xiang Min;Guo Jin(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043

出　　处：《石家庄铁道大学学报（自然科学版）》2022年第4期1-7,共7页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：国家自然科学基金面上项目(52178493);河北省重点研发计划项目(21375402D)。

摘　　要：为探求不同高墩结构刚构桥的动力响应及易损性,以某双肢薄壁高墩(RC墩)连续刚构桥为工程背景,提出钢板连接的钢管混凝土高墩(CFS-1墩)刚构桥和双波折腹板连接的钢管混凝土高墩(CFS-2墩)刚构桥;计算动力特性,采用增量动力分析法得到不同级别地震动加速度峰值下3座桥梁的地震响应;根据3种桥墩结构不同损伤状态下的损伤指标,绘制IDA曲线,计算损伤超越概率。结论如下:3种高墩结构刚构桥前2阶动力特性差异较大,RC墩刚构桥1阶周期比CFS墩小很多且两者1、2阶振型不同;地震波加速度峰值较小时,CFS墩刚构桥墩顶位移大于RC墩,两者差距随加速度峰值增大而减小,1/2处墩高位置位移在地震动作用几秒后产生,同加速度峰值下的CFS墩刚构桥墩底弯矩明显小于RC墩;相同条件下,CFS墩刚构桥抗震性能更好。In order to explore the dynamic response and vulnerability of rigid frame bridges with different high pier structural forms,a concrete-filled steel tube(CFS-1 pier)rigid frame bridge connected with steel plates and a concrete-filled steel tube(CFS-2 pier)rigid frame bridge connected with double corrugated webs were proposed based on a continuous rigid frame bridge with double thin-walled high piers(RC pier).The dynamic characteristics were calculated,and the seismic responses of the three bridges under different levels of ground motion acceleration peak were obtained by using the incremental dynamic analysis method.According to the damage indexes of the three pier structures under different damage states,the IDA curve was drawn and the damage transcendence probability was calculated.The conclusions are as follows:the first two order dynamic characteristics of three types of high pier rigid frame bridges are quite different.The first order period of RC pier rigid frame bridge is much smaller than that of CFS pier,and the first and second order vibration modes are different.When the peak acceleration of seismic wave is small,the displacement at the top of CFS pier rigid frame bridge is larger than that of RC pier,and the difference between the two decreases with the increase of the peak acceleration.The displacement at 1/2 of the pier height is generated after several seconds of earthquake action,and the bending moment at the bottom of CFS pier rigid frame bridge under the same peak acceleration is obviously smaller than that of RC pier.Under the same conditions,the seismic performance of CFS pier rigid frame bridge is better.

关 键 词：双肢薄壁高墩 钢管混凝土高墩 双波折腹板 增量动力分析 IDA曲线 损伤超越概率 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]