汽车制动作用下混凝土梁桥下部结构动力响应分析  

Dynamic performance analysis of substructure for concrete girder bridges under vehicle braking

作　　者：杨婷婷 李岩[2] 李全林 YANG Tingting;LI Yan;LI Quanlin(School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China;School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin 150090,China;Shenzhen Highway Engineering Consulting Company,Shenzhen 518094,China)

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090 [2]哈尔滨工业大学交通科学与工程学院,黑龙江哈尔滨150090 [3]深圳高速工程顾问有限公司,广东深圳518094

出　　处：《铁道科学与工程学报》2020年第3期637-644,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51108132);黑龙江省自然科学基金资助项目(LH2019E049)。

摘　　要：将制动力系数变化拟合为时变斜坡函数,由变形协调条件和力的平衡方程推导车辆各轮时变制动力,进而建立考虑汽车制动作用的车桥耦合空间动力分析模型并编制计算程序。依托某混凝土梁桥工程实例,采用所编制的程序,分析汽车制动作用下桥梁下部结构的动力行为特性。系统开展初始车速、制动加速度上升时间、制动峰值系数和车重等关键参数对桥梁下部结构动力响应的影响分析。研究结果表明:车辆制动作用下墩顶纵桥向动力响应显著,且该响应随制动加速度上升时间的缩短、制动峰值系数及车重的提高而大幅增加,初始车速对其有影响但无单调性规律。The change of the braking coefficient was assumed as a time-varying slope function and the time-varying braking force of each wheel was distributed by using the deformation compatibility condition and force balance equation.Then the vehicle-bridge coupling dynamic analysis model considering braking load was established and the corresponding calculating program was built.Based on a concrete girder bridge,the dynamic behavior of the bridge under the action of vehicle braking was analyzed with the program.The influence factors such as initial velocity,braking acceleration rise time,peak braking factor and vehicle weight on dynamic response of bridge piers were studied.The results show that the longitudinal vibration response of pier top is significantly affected by the braking effect.With the reduction of the braking acceleration rise time,the increase of peak brake factor and vehicle weight,the longitudinal response of the pier increases greatly.The initial velocity has an effect on it,but there appears no linear relationship.

关 键 词：混凝土梁桥 车桥耦合振动 制动作用 下部结构 动力分析 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]