空间异形拱桥振动台试验设计  

Shaking table test design of special irregular arch bridge

作　　者：韩强[1] 刘芃汐 惠斌 张广达 许坤[1] 王利辉[1] 贾振雷 HAN Qiang;LIU Pengxi;HUI Bin;ZHANG Guangda;XU Kun;WANG Lihui;JIA Zhenlei(National Key Laboratory of Bridge Engineering Safety and Resilience,Beijing University of Technology,Beijing 100124,China;Beijing General Municipal Engineering Design and Research Institute Co.,Ltd.,Beijing 100082,China)

机构地区：[1]北京工业大学桥梁工程安全与韧性全国重点实验室,北京100124 [2]北京市市政工程设计研究总院有限公司,北京100082

出　　处：《地震工程与工程振动》2024年第1期104-114,共11页Earthquake Engineering and Engineering Dynamics

基　　金：国家重点研发计划青年科学家项目(2022YFB2602500)。

摘　　要：振动台试验是研究大型结构复杂动力特性和地震响应的有效手段,由于振动台尺寸和载重的限制,合理设计缩尺模型结构是振动台试验成功的关键。基于量纲相似法及弹性相似律,取1∶20的几何相似比,以某空间异形拱桥为原型,开展了其关键参数动力缩尺模型设计。首先,通过有限元数值分析,分析了动力作用下原桥模型与缩尺桥模型的动力特性、关键部位内力与位移等响应,以验证缩尺模型的合理性;并在选取合理地震动作用下,开展了结构时程响应分析。研究结果表明:缩尺模型桥与原型桥前10阶模态完全吻合且频率误差小于7%,关键截面内力、位移和加速度等响应误差未超过10%,缩尺模型桥可较好地反映原桥动力特性和响应特点。研究成果可为空间异形拱桥振动台抗震设计提供技术支撑并为同类桥梁振动台试验提供参考。Shaking table test is an effective means to study the complex dynamic characteristics and seismic response of large structures,and it is the key to desigh the scale model structure in the shaking table test due to the limitation of shaker size and load.Based on the dimensional similarity method and elastic similarity law,the geometric similarity ratio of 1∶20 was taken,and the design of the dynamic scale model of key parameters was carried out using a spatial special-shaped arch bridge as the prototype.Firstly,through finite element numerical analysis,the dynamic characteristics,internal forces and displacements of the original bridge model and the scaled bridge model under dynamic action are analyzed to verify the rationality of the scaled model.Under the selection of reasonable seismic action,the structural time history response analysis was carried out.The calculation results show that the scaled model bridge is completely consistent with the first tenth-order mode of the prototype bridge with the frequency error less than 7%,the response error of internal force,displacement and acceleration of the key section has not exceeded 10%,and the scaled model bridge can reflect the dynamic characteristics and response characteristics of the original bridge.This research work can provide technical support for the seismic design of shaking table of space irregular arch bridge,and provide reference for shaking table tests of similar bridges.

关 键 词：空间异形拱桥 动力缩尺模型 动力特性 动力响应 

分 类 号：TU4[建筑科学—土工工程]