上承式钢管混凝土拱桥动力响应分析  

Dynamic response analysis of deck-type concrete-filled steel tubular arch bridge

作　　者：余钱华 高齐松 YU Qianhua;GAO Qisong(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《交通科学与工程》2024年第6期1-8,共8页Journal of Transport Science and Engineering

基　　金：国家自然科学基金项目(52078058)。

摘　　要：为了探讨钢管混凝土拱桥在车辆荷载作用下的动力响应,以湖南省湘西州涂乍特大桥为工程依托,利用MATLAB软件编写车-桥耦合振动数值分析迭代程序,提取车辆对桥梁的作用力,利用ANSYS软件中的瞬态动力分析模块对钢管混凝土拱桥车-桥耦合振动进行分析。结果表明:相较于拱肋完全黏结状态,拱肋完全脱黏后一阶频率下降,面内一阶振型提前出现,且频率下降幅度比面外的大;桥面不平顺度对钢管混凝土拱桥动力响应的影响比其他因素的大;行车速度对钢管混凝土拱桥动力响应的影响没有明显规律,但存在一个车辆与桥梁共振的行车速度,对于涂乍特大桥而言,行车速度为20 m/s时的动力放大系数最大;完全脱黏后的动力放大系数有所减小,其中L/4(L为桥长)处的减小幅度要比拱顶的大。This study aims to discuss the dynamic response of concrete-filled steel tubular arch bridges under vehicle loads.With the Tuzha Bridge in Xiangxi Tujia and Miao Autonomous Prefecture,Hunan Province as the engineering background,an iterative program for numerical analysis of vehicle-bridge coupling vibration was compiled using MATLAB software,and the force of vehicles on the bridge was extracted.The vehicle-bridge coupling vibration of the concrete-filled steel tubular arch bridge was analyzed using the transient dynamic analysis module of ANSYS software.The results show that the first-order frequency decreases for the completely debonded arch rib compared with the fully bonded one.In addition,the first-order vibration mode appears in advance in the plane after the arch rib is completely debonded,and the frequency decrease is greater than that out of the plane.The influence of bridge deck unevenness on the dynamic response of the concrete-filled steel tubular arch bridge is greater than those of other factors.While no obvious law is found in the influence of driving speed on the dynamic response of concrete-filled steel tubular arch bridges,there is a driving speed at which the vehicle resonates with the bridge.For the Tuzha Bridge,the dynamic amplification factor is largest when the driving speed is 20 m/s.The dynamic amplification factor decreases after complete debonding,and the reduction at L/4(L is length of the bridge)is greater than that at the arch crown.

关 键 词：车-桥耦合振动 动力响应 拱肋脱黏 钢管混凝土拱桥 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]