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  卢永飞,秦亮.T形刚构桥桥墩参数对车-桥动力响应影响研究[J].震灾防御技术,2020,15(4):718-730, DOI:10.11899/zzfy20200406.

T形刚构桥桥墩参数对车-桥动力响应影响研究
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。
作者单位
卢永飞 西北民族大学 土木工程学院, 兰州 730030
兰州交通大学 土木工程学院, 兰州 730070 
秦亮 甘肃省交通规划勘察设计院股份有限公司, 兰州 730030 
关  键  词:铁路桥梁  双薄壁桥墩  数值计算  动力响应  车桥耦合
DOI:10.11899/zzfy20200406
基金项目:西北民族大学中央高校基本科研业务费资金资助项目(31920160065)
收稿日期:2020-04-15
作者简介:卢永飞,男,生于1982年。博士研究生,讲师。主要从事桥梁结构动力学方面的教学与研究工作。E-mail:cjj5bf@163.com
通讯作者:
Study on Influence of Pier Parameters of T-shaped Rigid Frame Bridge on Vehicle Bridge Dynamic Response
Abstract:      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.
Keywords:  Railway bridger  Double thin-walled pier  Numerical calculation  Dynamic response  Vehicle-bridge coupling
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