独柱墩简支梁桥抗震性能的振动台试验研究  

Shaking table test of seismic performance of a simply-supported girder bridge with single column

作　　者：邵长江[1,2] 漆启明 韦旺 胡晨旭 王猛[1] 肖来川 肖正豪 SHAO Changjiang;QI Qiming;WEI Wang;HU Chenxu;WANG Meng;XIAO Laichuan;XIAO Zhenghao(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;National Engineering Laboratory of Geological Disaster Prevention Technology in Land Transportation,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学土木学院,成都610031 [2]西南交通大学陆地交通地质灾害防治技术国家工程实验室,成都610031

出　　处：《振动与冲击》2019年第16期49-55,共7页Journal of Vibration and Shock

基　　金：国家自然基金(51178395);四川省应用基础研究重点项目(2017JY0059)

摘　　要：近年来出现的独柱墩梁桥横向倾覆事故及震害引起了广泛关注,关于其横向稳定性的研究取得了丰硕成果;然而与横桥向相比,地震作用下纵桥向的安全性仍然是非常重要的研究课题。为此,按现行规范设计制作了一跨缩尺比例圆形截面独柱墩简支梁桥模型,以E1 Centro地震波为纵竖向输入地震动,进行了大比例尺整桥单台面振动台试验;通过观察试验现象,分析了结构加速度、位移响应、滞回特性及钢筋混凝土应变,研究了桥梁在不同等级加速度下的损伤状态及动力响应规律。结果表明:梁体纵向位移较大,易发生由纵向碰撞引起的落梁及损伤;固定等效水平力-位移滞回曲线规则,其墩顶位移较活动墩大,墩底所受的力远大于活动墩,在抗震设计中应尤为关注固定墩的构造设计。Recently,lateral collapse and seismic disasters caught much attention.Many achievements on lateral stability sprung up in the last few years.However,the longitudinal seismic properties of a single-column bridge are still unsolved.Thus,a scaled model of a single-span reinforced concrete bridge was designed using the current code.El Centro earthquake wave was selected as longitudinal and vertical input ground motion.This model was tested by a single large shaking table.According to the experimental phenomenon,the acceleration,displacement,hysteretic performance and strain of concrete and steel were investigated.The damage status and dynamic response characteristics under different earthquake excitation were studied.The results show that:large longitudinal displace of pier is prone to leading to unseating or damage due to collision;the hysteretic curve of a fixed pier is more regular than that of a movable pier,the drift ratio of the fixed pier is much larger than that of a movable pier,and the earthquake force at the bottom is much large than that of a movable pier,which implies that much attention should be paid to the design of a fixed column.

关 键 词：独柱墩梁桥 振动台试验 抗震设计 试验现象 地震响应 滞回曲线 应变分布 

分 类 号：TU357.3[建筑科学—结构工程]