考虑轨道约束的高速铁路简支梁碰撞效应研究

发布时间：2018-06-25 05:20

本文选题：铁路桥 + 简支梁桥　；参考：《桥梁建设》2014年06期

【摘要】：为研究轨道结构对简支梁桥碰撞效应的影响规律,以沪昆线上某4-32m简支箱梁为例,采用大质量法分析地震动的行波效应,用Kelvin单元分析桥梁碰撞,用非线性杆单元模拟梁轨接触,建立了考虑滑动支座摩阻力、桥墩弯矩曲率非线性和桩土共同作用的梁轨系统动力有限元模型,分析了一致激励和行波效应下考虑轨道约束的高速铁路简支梁桥碰撞效应,并对梁缝宽度、线路纵向阻力等设计参数进行了敏感性分析。结果表明:轨道结构对桥梁纵向位移起到了约束作用,可减弱甚至消除梁体间的碰撞效应;适当增加梁缝宽度,可大幅度减小梁体碰撞次数和撞击力;线路纵向阻力减弱时(如采用小阻力扣件时),梁体间的碰撞效应增强。
[Abstract]:In order to study the influence of track structure on the impact effect of simply supported girder bridge, taking a 4-32m simply supported box girder on the Shanghai-Kunming Railway as an example, the traveling wave effect of ground motion is analyzed by using the large mass method, and the bridge collision is analyzed by Kelvin element. The nonlinear bar element is used to simulate the contact of beam and rail, and a dynamic finite element model of beam rail system considering the friction of sliding support, the nonlinear moment curvature of pier and the interaction of pile and soil is established. The collision effect of a simple supported beam bridge with track constraints under uniform excitation and traveling wave effect is analyzed. The sensitivity analysis of the design parameters such as the width of beam joint and the longitudinal resistance of the line is carried out. The results show that the track structure can restrain the longitudinal displacement of the bridge, weaken or even eliminate the collision effect between beams, and increase the width of beam joints to reduce the number of collisions and the impact force. The collision effect between beams increases when the longitudinal resistance of the line decreases (such as using small resistance fastener).
【作者单位】：中南大学土木工程学院;
【基金】：高速铁路基础研究联合基金项目(U1334203) 中国博士后科学基金资助项目(2014M552158)~~
【分类号】：U441.3

【参考文献】