地震作用下车辆-公路桥梁耦合作用的能量机理  

Energy Mechanism of Vehicle-highway Bridge Dynamic Interaction under Earthquake

作　　者：徐艳[1] 林国才 崔存玉 XU Yan;LIN Guocai;CUI Cunyu(State Key Laboratory of Disaster Reduction in Civil Engineering(Tongji University),Shanghai 200092,China;Shanghai Municipal Engineering Design Institute(Group)Co.Ltd.,Shanghai 200092,China)

机构地区：[1]土木工程防灾国家重点实验室(同济大学),上海200092 [2]上海市政工程设计研究总院(集团)有限公司,上海200092

出　　处：《湖南大学学报（自然科学版）》2024年第5期88-94,共7页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51878492)。

摘　　要：由于地震作用下车辆和公路桥梁相互耦合作用的复杂性,目前对其相互作用机理的研究较少,导致各国现行公路桥梁抗震设计规范关于桥梁在地震作用时是否需要考虑活载作用仍然存在分歧.现有研究表明,车辆既可能对桥梁的地震响应产生有利影响,也可能产生不利的影响.本文在已有的研究基础上,对车桥耦合接触行为进行简化模拟,采用能量法对车辆-公路桥梁耦合作用机理进行分析.结果表明:车桥耦合作用对输入到桥梁水平方向能量的影响可以忽略不计,但会导致输入到桥梁竖向总能量的减小,因而使桥梁的竖向地震响应减小,而输入到车辆竖向的能量则主要来自桥面振动;此外,车辆质量越小,桥梁振动产生的对车辆水平方向的能量输入越大.Due to the complexity of seismic coupling between vehicles and highway bridges,current research on the mechanism of vehicle-bridge interaction under seismic action is relatively scarce,leading to diverse specifications about whether live load should be taken into account in national seismic bridge design codes.Existing studies have shown that vehicles possibly would produce beneficial effect on bridge seismic responses in one circumstance but adverse effects in another.The simulation of contact behaviors between vehicle and bridge is simplified in this study.On this basis,the mechanism of vehicle-bridge interaction is analyzed thoroughly by employing the energy method.Analysis results demonstrate that the impact of vehicle-bridge interaction on horizontal energy input to the bridge is negligible.However the interaction can reduce the total energy input to the bridge in the vertical direction,therefore reducing the vertical seismic responses of the bridge,while input energy to the vehicle’s vertical direction comes mainly from the bridge’s vibration.On the other hand,the smaller the vehicle mass,the greater the horizontal input energy to the vehicle caused by bridge vibration.

关 键 词：车桥耦合 能量法 调谐质量阻尼器 桥梁抗震 接触单元 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]