重载铁路T梁桥病害对车桥系统动力性能的影响  

Influence of Damages of Heavy⁃haul Railway T⁃girder Bridge on Dynamic Performance of Vehicle⁃Bridge System

作　　者：马骞 孙皓晨 战家旺[2] MA Qian;SUN Haochen;ZHAN Jiawang(Guoneng Shuohuang Railway Development Co.Ltd.,Cangzhou Hebei 062350,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]国能朔黄铁路发展有限责任公司,河北沧州062350 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《铁道建筑》2023年第10期49-54,共6页Railway Engineering

摘　　要：为明确重载铁路桥梁横隔板损伤成因及多重病害对车桥系统动力性能的影响,以朔黄铁路一座混凝土简支梁桥为研究对象,分析线桥偏心和支座脱空对横隔板受力性能的影响,基于桥梁振幅、加速度、车辆轮重减载率、脱轨系数及车体加速度分析多重病害作用对车桥动力响应的影响。结果表明:线桥偏心和支座脱空是影响跨中和端横隔板损伤的重要因素,横隔板损伤程度随线桥偏心及支座脱空程度的增大而增大;线桥偏心与横隔板损伤耦合作用下车桥动力响应有所增大,对桥梁横向振动产生的不利影响较大;当支座脱空达到一定程度且横隔板发生破坏时,列车平稳性能下降程度较大。To clarify the causes of damages to diaphragm of heavy haul railway bridge and the impact of multiple diseases on the dynamic performance of the vehicle bridge system,a concrete simply supported girder bridge on the Shuozhou-Huanghuagang railway was taken as the research object to analyze the impact of eccentricity and support detachment on the mechanical performance of the diaphragm.Based on bridge amplitude,acceleration,vehicle wheel load reduction rate,derailment coefficient,and vehicle body acceleration,the impact of multiple diseases on the dynamic response of the vehicle bridge was analyzed.The results show that the eccentricity of the bridge and the detachment of the support are important factors that affect the damage of the mid span and end diaphragm.The degree of diaphragm damage increases with the increase of the eccentricity of the bridge and the detachment of the support.The coupling effect of eccentricity of the bridge and damage to the diaphragm increases the dynamic response of the bridge,with a significant adverse impact on the transverse vibration of the bridge.When the support becomes detached to a certain extent and causes damage to the diaphragm,there is a significant reduction in the stability performance of the train.

关 键 词：重载铁路桥梁 动力性能评价 数值模拟 横隔板损伤 应力分析 线桥偏心 支座脱空 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]