摘要
基于车-线-桥耦合动力学理论,运用动柔度法建立了车-线-桥垂向耦合振动频域分析模型,分析了1个和3个扣件失效对耦合系统垂向振动频率响应的影响。计算结果表明:扣件失效对车体振动加速度的影响很小,但对钢轨振动加速度影响较大,且其影响随着失效扣件数量的增加而增大;扣件失效对桥梁振动加速度的影响比对钢轨要小一些;扣件失效对相邻扣件支反力的影响较大,会加速相邻扣件的破坏,引起连锁反应,危及行车安全。
Based on vehicle-track-bridge coupling dynamics theory,the frequency domain analysis model of vehicle-track-bridge system coupling vibration was established by using the dynamic flexibility method.And effects of 1 or 3 fasteners failure on the vibration frequency of coupling system were analyzed.The results show that the inf luence of fastener failure on the vibration acceleration of vehicle body is little,but its influence on the vibration acceleration of rail is greater,and the more fasteners fail,the influence is more obvious.The influence of fastener failure on the vibration acceleration of bridge is less than that of rail.Fastener failure has great influence on the reaction force of adjacent fasteners,and it will accelerate the destruction of adjacent fasteners,cause chain reaction and even do harm to operation safety.
作者
毛建红
张金喜
罗俊
MAO Jianhong;ZHANG Jinxi;LUO Jun(College of Metropolitan Transportation,Beijing University of Technology,Beijing 100124,China;School of Civil Engineering,Central South University,Changsha Hunan 410075,China)
出处
《铁道建筑》
北大核心
2018年第11期146-149,共4页
Railway Engineering
基金
国家自然科学基金(51478021)
中国博士后科学基金(71038003201701)
北京市博士后工作经费资助项目(Q6038003201701)
关键词
城市桥梁
频率响应
理论分析
数值模拟
车线桥耦合系统
扣件失效
动柔度法
Urban bridge
Frequency response
Theoretical analysis
Numerical simulation
Vehicle-track-bridge coupling system
Fastener failure
Dynamic flexibility method
