铁路桥墩横桥向地震反应分析模型对比分析  

Analysis and Comparison of Analysis Models for Seismic Responses of Railway Bridge Transverse Piers

作　　者：马朗 夏修身[1] 陈兴冲[1] 韦性涵 MA Lang;XIA Xiu-shen;CHEN Xing-chong;WEI Xing-han(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学土木工程学院

出　　处：《兰州交通大学学报》2019年第2期20-25,共6页Journal of Lanzhou Jiaotong University

基　　金：国家自然科学基金(51368033,51668035);中国铁路总公司科技研究开发计划课题(2015G002-B)

摘　　要：常见铁路桥墩的横桥向截面尺寸与墩高相差较小,而顺桥向相差较大,不能较好地符合梁单元的受力特征.为研究铁路桥墩横桥向地震反应,设计了一种新型的重力式桥墩模拟方法,考查常规梁单元及板单元模拟铁路桥墩的精度.基于某铁路简支梁桥,分别采用多垂直杆元模型与梁、板单元进行重力式桥墩模拟,建立四种有限元模型,进行地震反应分析及结果比较.结果表明:欧拉梁和铁木辛柯梁及板单元模型的墩底内力及墩顶位移均小于多垂直杆元模型,建议重要结构的铁路桥墩按多垂直杆元模型进行地震反应分析;欧拉梁和铁木辛柯梁及板单元模型的墩底内力与多垂直杆元模型相差在5%以内,三种模型计算的桥墩内力具有工程可接受的精度,但墩顶位移误差超过5%,设计时需要考虑;板单元模型与多垂直杆元模型的吻合程度好于欧拉梁模型,而欧拉梁模型好于铁木辛柯梁模型.研究结论可供铁路工程抗震设计规范修订时参考.The difference between the transverse direction dimension and the height of the common railway pier is small,by contrast,it is large for the longitudinal direction which cannot well meet the stress characteristics of the beam element.In order to study the seismic responses of railway piers,a new type of gravity piers simulation method is designed,and the accuracy of beam element and plate element are analyzed to simulate railway piers.Based on a simple supported beam bridge,the multi-vertical bar-element model,the beam element and the plate element are used to simulate the gravity bridge pier,and four kinds of the finite element model are established,then the seismic responses analysis and the comparison are made.The results show that the pier bottom internal force and pier top displacement of the beam model and plate beam model are less than the multi-vertical bar-element model,it is suggested that the seismic responses analysis of railway piers with important structures should be carried out according to the multi-vertical rod-element model.The internal force at the bottom of the Euler and Timoshenko beam and plate element model is within 5% of that of the multi-vertical bar-element model,the internal forces of the piers calculated by the three models have an engineering acceptable accuracy,but it should be considered in design when the displacement error of the pier top exceeds 5%.The plate element model is more consistent with the multi-vertical bar-element model than the Euler beam model,while the Euler beam model is better than that of the Timoshenko beam model.The conclusions of the study can be used as a reference for the revision of seismic design codes of railway engineering.

关 键 词：桥梁工程 模型对比 有限元法 多垂直杆元模型 梁、板单元 

分 类 号：U443.22[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]