速度锁定型自复位防屈曲支撑对桥梁的影响规律研究  

Research on the influence law of Lock-Up Self-Centering Buckling-Restrained Braces on bridge performance

作　　者：黎子荣 刘立鹏[1] 张杨怡 刘羽 LI Zirong;LIU Lipeng;ZHANG Yangyi;LIU Yu(Harbin Institute of Technology,Harbin 150090,China;Times Holding Group Co.,Ltd,Guangzhou 510000,China)

机构地区：[1]哈尔滨工业大学交通科学与工程学院,哈尔滨150090 [2]时代控股集团有限公司,广州510000

出　　处：《世界地震工程》2020年第2期146-154,共9页World Earthquake Engineering

基　　金：黑龙江省自然科学基金项目LH2019E049。

摘　　要：依托某连续梁桥,建立3种不同纵向支撑形式的有限元模型,通过模态分析和动力时程分析,研究不同支撑形式对结构动力性能和抗震性能的影响规律。结果表明:在动力性能方面,与不设置纵向支撑系统相比,设置LU-SC-BRB的桥梁结构各阶振动频率不变,而设置SC-BRB桥梁模型的纵向刚度以及自振频率均有提高。在抗震性能方面:设置LU-SC-BRB的桥梁结构能够对墩底剪力、弯矩峰值以及墩顶纵向位移峰值有较为明显的控制作用;同时,设置LU-SC-BRB支撑与设置SC-BRB支撑的桥梁结构相比抗震性能好,并能避免温差等导致次内力及附加约束。Based on a continuous beam bridge structure,finite element models were established for three different Longitudinal Support System(LSS).The structure’s dynamic behavior and seismic performance influenced by different LSSs were investigated with the modal analysis and time-history analysis.Compared to the structure without LSS,it doesn’t change the structural vibration frequency to the structure by installing the Lock-Up Self-Centering Buckling-Restrained Brace(LU-SC-BRB),while it makes the structural longitudinal rigidity and vibration frequency increase by installing the Self-Centering Buckling-Restrained Brace(SC-BRB).In terms of seismic performance,the peak value of shear force and moment at the bottom of the pier and the longitudinal peak displacement of the top of pier are reduced evidently by using LU-SC-BRB.Meanwhile,the structure installed with LU-SC-BRB can avoid the thermal secondary force and additional restraint compared to that with SC-BRB.

关 键 词：连续梁桥 纵向支撑系统 动力性能 抗震性能 次内力 

分 类 号：U442.5[建筑科学—桥梁与隧道工程] U448.21[交通运输工程—道路与铁道工程]