近断层高低墩连续刚构桥抗震分析  

Seismic Analysis of Continuous Rigid Frame Bridge with High-low Piers in the Near-Fault Area

作　　者：何伟[1,2] 刘鹏[3] He Wei1,2, Liu Peng3(1, Chongqing Jiaotong University, Chongqing 4-00074, China ;2, Sichuan College of Architecture Technology, Deyang 618000, China ; 3, China Railway Eryuan Engineering Group Co. Ltd , Chengdu 610031 , Chin)

机构地区：[1]重庆交通大学,重庆400074 [2]四川建筑职业技术学院,四川德阳618000 [3]中国中铁二院工程集团有限责任公司,四川成都610031

出　　处：《工程抗震与加固改造》2018年第1期72-75,共4页Earthquake Resistant Engineering and Retrofitting

基　　金：四川省博士后基金资助课题

摘　　要：本文以30m+15m组合墩高和30m+45m组合墩高两种连续刚构桥为例,研究了近断层地震作用下,桥梁的地震响应和桥墩损伤情况。结果表明,近断层地震动脉冲周期大、低频集中度高、能量输入大的特性明显放大了高低墩地震响应的不一致性,同一组合中高墩、低墩的位移时程不一致,这会造成梁体产生扭转;同一组合中低墩的墩顶截面承受更大的弯矩,更容易发生损伤,这在设计时需要引起重视;同一组合中高墩、低墩的墩底截面弯矩相差不大。Based on two continuous rigid frame bridges as an example,pier height of one bridge is 30 m ＋ 15 m,another is 30 m ＋ 45 m,the seismic response of bridge and the pier damage under near-fault seismic waves are studied. The characteristics of near fault earthquake： large period of arterial shock,low frequency concentration and large energy input can obviously enlarge the inconsistency of seismic response between high and low piers. In the same combination of piers the displacement time history of high pier and low pier are different,which will generate torsion in the beam; in the same combination of piers there are greater bending moment in pier top section of low pier,which is more prone to injury,so the problem requires enough attention in the design; there is little difference in bending moment of pier bottom section in the same combination of piers.

关 键 词：近断层 高低墩 连续刚构桥 纤维单元 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]