基于振动台试验的超高墩连续刚构桥地震响应研究  

Research on seismic response of continuous rigid frame bridges with ultra-high-pier based on a shaking table test

作　　者：闫晓宇[1] 赵卓[2] 曹珊珊 杜修力[2] 王瑾[3] 刘从会 白少聪 Yan Xiao-yu;Zhao Zhuo;Cao Shan-shan;Du Xiu-li;Wang Jin;Liu Cong-hui;Bai Shao-cong(The Open University of China School of Engineering,Beijing 100039,China;Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing 100124,China;School of Water Resources and Hydropower Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]国家开放大学理工教学部,北京100039 [2]北京工业大学城市建设学部,北京100124 [3]华北电力大学水利与水电工程学院,北京102206

出　　处：《工程抗震与加固改造》2025年第2期115-123,共9页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金(52178446);北京工业大学重点实验室校外开放课题(2022B02)。

摘　　要：随着我国交通网不断扩大,超高墩连续刚构桥成为山区、深谷地区常见桥型之一,目前其抗震研究成果较为欠缺。本文在开展单墩振动台试验基础上,建立经试验结果验证的超高墩连续刚构桥精细化有限元模型,通过系统性的弹塑性时程分析,探究地震动特性、主桥跨径、桥墩高度、系梁个数等参数对超高墩连续刚构桥地震响应的影响规律。结果表明:超高墩连续刚构桥结构周期较大,对长周期地震动更为敏感,对应的地震响应明显大于非长周期地震动作用下的地震响应;近断层脉冲型地震动作用引起的超高墩连续刚构桥地震响应大于非长周期地震动作用引起的地震响应,且当TP≈T1时地震响应最大;超高墩连续刚构桥纵桥向和横桥向均出现高阶振型效应,且随着墩高增大,高阶振型参与现象更为明显;沿纵桥向、横桥向输入时地震响应变化规律相同,当桥梁跨径为定值,墩顶位移幅值均随墩高的增高而增大,墩底弯矩峰值随墩高的增高而减小,当桥梁墩高为定值,墩顶位移幅值和墩底弯矩峰值均随跨径的增大而增大;横桥向地震动作用下,系梁展现出较好耗能能力,系梁合理布置有利于提高超高墩连续刚构桥的横向抗震性能。With the continuous expansion of the transportation network in China,the continuous rigid frame bridges with ultra-high-piers have been used commonly in mountainous and deep valley areas.Currently,their seismic research results are relatively lacking.The precise finite element model of a continuous rigid frame bridge with ultra-high-piers is established and verified based on the results of a single pier shaking table test.The systematic elastic-plastic time history analysis is conducted to investigate the effects of ground vibration characteristics,main bridge span,pier height,number of tie girders,and other parameters on the seismic response of ultra-high-pier continuous rigid-frame bridges.The results show that the structural period of the ultra-high-pier continuous rigid bridge is larger,which is relatively more sensitive to long period ground motions,and the corresponding seismic response is obviously larger than that of non-long period ground motions.Under the action of near-fault impulse-type ground motion,the seismic response of the continuous rigid frame bridge with super high piers is larger than that under the action of non-long-period ground motion.Seismic response of ultra-high-pier continuous rigid frame bridges caused by near-fault impulsive ground motions is larger than that caused by non-long period ground motions.The seismic response is largest when TP≈T1.Higher-order vibration effects appear in both the longitudinal and transverse directions.The participation of higher-order vibration is more obvious with the increase of pier height.Same pattern of change is shown in seismic response along longitudinal and transverse bridge inputting.When the length of bridge span remains constant,the amplitude of the displacement at the top of the pier increases with the increase of the pier height,while the peak moment at the pier bottom decreases.When the height of bridge pier remains constant,the displacement amplitude at the pier top and the peak moment at the pier bottom both increase with the increase o

关 键 词：超高墩 连续刚构桥 地震响应 振动台试验 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]