T形刚构桥桥墩参数对车-桥动力响应影响研究  

Study on Influence of Pier Parameters of T-shaped Rigid Frame Bridge on Vehicle Bridge Dynamic Response

作　　者：卢永飞[1,2] 秦亮[3] Lu Yongfei;Qin Liang(School of Civil Engineering,Northwest Minzu University,Lanzhou 730030,China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Gansu Province Transportat Planning,Survey and Design Institute Co.,Ltd,Lanzhou 730030,China)

机构地区：[1]西北民族大学土木工程学院,兰州730030 [2]兰州交通大学土木工程学院,兰州730070 [3]甘肃省交通规划勘察设计院股份有限公司,兰州730030

出　　处：《震灾防御技术》2020年第4期718-730,共13页Technology for Earthquake Disaster Prevention

基　　金：西北民族大学中央高校基本科研业务费资金资助项目(31920160065)。

摘　　要：为研究T形刚构桥桥墩参数对车-桥动力响应的影响,以某高速铁路(77m+144m+77m)T形双薄壁连续刚构桥为研究对象,基于刚柔耦合理论,采用多体动力学和有限元联合仿真技术,建立考虑桩土效应的列车-桥梁动力相互作用模型,计算分析T形刚构桥墩宽度、厚度及混凝土强度等级变化对车-桥耦合系统的动力响应影响。结果表明:T形刚构桥墩宽度、厚度及混凝土强度等级的改变,对桥上车辆系统的安全性指标、舒适性指标影响较小;T形刚构桥墩参数改变,对桥梁系统横向位移、垂向加速度、横向加速度影响较小,而对垂向位移影响较大,但变化幅值均在高速铁路设计规范要求的范围内;在其他条件参数不变的情况下,可通过将桥墩宽度降低到设计宽度的75%—80%,或厚度降低到设计厚度的80%—85%,或桥墩混凝土强度等级降低为C35—C40对该高速铁路T形双薄壁连续刚构桥进行优化设计。In order to study the influence of the parameter variation of the T-shaped rigid frame bridge on the dynamic response of the vehicle-bridge,taking a high-speed railway(77m+144m+77m)T-shaped double thin-wall continuous rigid frame bridge as the research object,using a multi-body dynamics and finite element co-simulation technology based on rigid-flexible couping theory a vehicle-bridge dynamic interaction model considering pile-soil effect is established,and using this model to calculate and analyze the influence of the width,thickness and concrete strength grade of T-shaped rigid frame pier on the dynamic response of the vehicle-bridge coupling system.the results show:the variation of the width,thickness and concrete strength grade of the T-shaped rigid frame pier has little effect on the safety index and comfort index of the vehicle system on the bridge;parameters of the T-shaped rigid frame piers have little influence on the lateral displacement,vertical acceleration and lateral acceleration of the bridge system,and have a great influence on the vertical displacement,but the variation amplitude is within the requirements of the code for design of high speed railway;For the high-speed railway(77m+144m+77m)T-shaped double thin-wall continuous rigid frame bridge,under the condition that other conditions are unchanged,the optimum design can be made to reduce the pier width to 75—80%of the designed width,or to reduce the thickness to 80—85%of the designed thickness,or to reduce the strength class of pier concrete to C35—C40.

关 键 词：铁路桥梁 双薄壁桥墩 数值计算 动力响应 车桥耦合 

分 类 号：U441.3[建筑科学—桥梁与隧道工程] U448.23[交通运输工程—道路与铁道工程]