大湾区城际铁路简支箱梁墩顶纵向刚度限值研究  

Study on Pier Top Longitudinal Stiffness Limit of Simply Supported Box Bridge of Intercity Railway in Greater Bay Area

作　　者：赵华卫 ZHAO Huawei(China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308

出　　处：《铁道标准设计》2023年第8期57-63,共7页Railway Standard Design

基　　金：中国铁路设计集团有限公司科技开发课题(2021A240102)。

摘　　要：为探究桥梁与轨道参数对无缝线路纵向受力变形的影响,确定大湾区城际铁路常用24 m和32 m简支箱梁墩顶纵向刚度限值,基于梁轨相互作用机理,建立钢轨-桥梁-墩台一体化有限元模型,开展墩顶纵向刚度对无缝线路伸缩力、制动力、梁轨快速相对位移的影响分析,并从无缝线路安全性出发,提出24 m和32 m简支箱梁墩顶纵向刚度限值。研究结果表明:钢轨及桥墩伸缩力均随墩顶纵向刚度的增加而增大,钢轨伸缩力变化幅度较缓,桥墩伸缩力变化幅度显著,两者增大趋势均随墩顶纵向刚度的增加而逐渐减缓;随着墩顶纵向刚度增加,钢轨制动力显著降低,墩台制动力显著增大,两者变化趋势均逐渐减缓;钢轨附加应力不控制墩顶纵向刚度取值;梁轨快速相对位移随墩顶纵向刚度增大而减小,以梁轨快速相对位移指标为控制条件,32 m单线简支箱梁墩顶纵向刚度限值建议取125 kN/cm, 24 m单线简支箱梁墩顶纵向刚度限值建议取90 kN/cm。To determine the influence of bridge parameters and track parameters on the longitudinal stress and deformation of CWR(Continuous Welded Rail),the pier top longitudinal stiffness limit of 24 m and 32 m simply supported box bridge of intercity railway in Greater Bay Area is determined.Based on the mechanism of the interaction between the beam and track,an integrated finite element model of rail,bridge body and pier is established.The influence of pier top longitudinal stiffness on the tensile and compressive force of CWR,braking force and rapid relative displacement of beam and rail is analyzed.The results show that:The tensile and compressive forces of rail and pier increase with the increase of pier top longitudinal stiffness.The change range of rails tensile and compressive force is slow,and that of piers tensile is significant.The increasing rate of both decreases gradually with the increase of pier top longitudinal stiffness.With the increase of the pier top longitudinal stiffness,the braking force at the rail decreases significantly,and the braking force at the pier increases significantly,and the change rate of both decreases gradually.The additional stress of the rail does not affect the determination of the pier top longitudinal stiffness.The rapid relative displacement between beam and rail decreases with the increase of the pier top longitudinal stiffness.Taking the rapid relative displacement of beam and rail as the limiting index,the longitudinal stiffness limit of 32 m single track simply supported box bridge is 125 kN/cm,and that of the 24 m single track simply supported box bridge is 90 kN/cm.

关 键 词：城际铁路 无缝线路 简支梁桥 墩顶纵向刚度 伸缩力 制动力 梁轨快速相对位移 

分 类 号：U213.9[交通运输工程—道路与铁道工程] U443.22[建筑科学—桥梁与隧道工程] U448.21