不同约束体系曲线梁桥震害调查及损伤模式分析  

Investigation of seismic damage and analysis of damage mode of curved bridges with different restraint systems

作　　者：吴刚 王克海[2] 宋帅 吴必涛[1] 王帅[3] WU Gang;WANG Kehai;SONG Shuai;WU Bitao;WANG Shuai(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China;Research Institute of Highway,Ministry of Transport,Beijing 100088,China;College of Architecture and Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]华东交通大学土木建筑学院,南昌330013 [2]交通运输部公路科学研究院,北京100088 [3]太原理工大学建筑与土木工程学院,太原030024

出　　处：《振动与冲击》2020年第12期113-120,141,共9页Journal of Vibration and Shock

基　　金：国家青年基金(51808376,51808219);山西交控集团科技项目(18-JKKJ-07,18-JKKJ-08);江西省青年科学基金(20192BAB216032)。

摘　　要：为明确地震作用下曲线梁桥震害成因、结构传力机制及薄弱部位,对采用不同约束体系的曲线梁桥进行震害调查及损伤模式分析。归纳总结了汶川地震中采用不同约束体系的曲线梁桥震害;采用非线性时程方法,对比分析了不同水平地震动作用下不同约束体系曲线梁桥构件损伤状态及损伤顺序,探讨了不同约束体曲线梁桥传力机制及耗能机制。研究结果表明:曲线梁桥典型震害主要表现为主梁刚体移位,并伴有转动,主梁移位易导致其与桥台、挡块等发生碰撞,抗震分析中应考虑主梁双向碰撞效应的影响;约束体系为桥梁系统关键薄弱部位,在地震作用下易发生损伤,可将其设计为“保险丝式”单元;不同约束体系曲线梁桥的震害表现及传力机制差异明显,主要取决于约束体系的力学特性,对于采用橡胶支座的桥梁应设置合理限位装置,设置固定墩的桥梁应加强桥墩塑性铰区设计。In order to identify the cause of earthquake damage,structural force transfer mechanism,and weak components of curved bridges under earthquake,investigation of the seismic damage and analysis of damage mode system of curved bridges with different restraint systems were carried out.The seismic damages of several curved bridges with different restraint systems occurred in Wenchuan earthquake were summarized.First,the nonlinear time-history method was used to compare and analyze the damage state and damage sequence of different components of curved bridges with different restraint systems under different level ground motions.Then the transmission mechanism and energy dissipation mechanism of curved bridges with different restraint systems were discussed.The results show that the typical seismic damage of curved bridges mainly appears as the main girder rigid body displacement,which is accompanied by in plane rotation.The main girder is easy to collide with the shear keys and abutment due to the movement.Therefore,the influence of bidirectional collision effect of main girder should be considered in the seismic analysis.The restraint system is a key weak component of the bridge system,which is prone to damage under earthquake,and it could be designed as“fuse element”.The difference of seismic damage performance and force transfer mechanism of curved bridges with different restraint systems is obvious,which mainly depends on the mechanical characteristics of the restraint system.It is recommended that bridges with rubber bearings should be reasonably set with movement limitation devices,and bridges with fixed piers should strengthen the plastic hinges of the bridge piers.

关 键 词：桥梁工程 约束体系 震害调查 损伤模式 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]