主桁整体可展铁路抢修梁研究  

Research on Railway Emergency Repair Beam with Integral Deployable Main Truss

作　　者：徐光兴[1,2] 张非凡 李朝红 李明阳 XU Guangxing;ZHANG Feifan;LI Zhaohong;LI Mingyang(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang Hebei 050043,China;Hebei Engineering Innovation Center for Traffic Emergency and Guarantee,Shijiazhuang Tiedao University,Shijiazhuang Hebei 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang Hebei 050043,China)

机构地区：[1]石家庄铁道大学,部共建交通工程结构力学行为与系统安全国家重点实验室,河北石家庄050043 [2]石家庄铁道大学河北省交通应急保障技术创新中心,河北石家庄050043 [3]石家庄铁道大学土木工程学院,河北石家庄050043

出　　处：《中国铁道科学》2023年第5期69-80,共12页China Railway Science

基　　金：国家重点研发计划项目(2016YFC0802207);河北省教育厅在读研究生创新能力培养资助项目(CXZZSS2022111)。

摘　　要：为解决既有铁路梁部抢修器材承载力低、通车速度慢、拼装效率低、存储运输不便等问题,进行主桁整体可展的铁路抢修梁研究。根据可展结构的特点,该抢修梁通过杆件与销轴的配合连接,使其主桁构架形成平行四边形多连杆可变机构,从而实现折叠与展开;整孔抢修梁由可展桁架构件、Z型或L型端构架、平纵联等模块组成,不同数量可展桁架构件与对应的端构架拼组可使抢修梁适应不同跨度、梁高、荷载类型的抢修工况;运用ANSYS软件和多体动力学软件UM进行该主桁可展抢修梁静力、模态以及动力响应分析。结果表明:抢修梁跨中上弦杆、梁端内斜腹杆、梁端销轴对抢修梁的安全性起控制作用;抢修梁静力和动力响应均随主桁片数的增多而逐渐降低,多片主桁组成的抢修梁更安全;抢修梁自振频率随主桁片数的改变而变化;抢修梁横向抗弯刚度较弱,增加主桁片数可提高抢修梁的横向和扭转自振频率,但对竖向自振频率提高不明显;抢修梁和车辆响应均随车速的提高而非线性增大,二者的响应共同决定抢修梁最大容许通车速度,增加主桁片数可提高抢修梁的通车速度。In order to solve the problems of low bearing capacity,slow traffic speed,low assembly efficiency,inconvenient storage and transportation of the emergency repair equipment of existing railway beam,the research on railway emergency repair beam with integral deployable main truss was carried out.According to the characteristics of the deployable structure,the main truss frame of the emergency repair beam is formed into a parallelogram multi-link variable mechanism through the coordination of the rod and the pin,so as to realize folding and unfolding.The combination of different number of deployable truss members,the corresponding end frames and the horizontal and longitudinal combination can make the emergency repair beams adapt to the emergency repair conditions of different spans,beam heights and load types.ANSYS software and multi-body dynamics software UM are used to analyze the static,modal and dynamic response of the deployable emergency repair beam of the main truss.The results show that the upper chord member in the mid-span,the inner inclined belly and the pin shaft at the beam end control the safety of the emergency repair beam.The static and dynamic response of the emergency repair beam decrease gradually with the increase of the number of main truss,and the emergency repair beam composed of multiple main trusses is safer.The natural vibration frequency of the emergency repair beam changes with the number of the main truss.The transverse bending stiffness of the emergency repair beam is weak,and the transverse and torsional natural vibration frequency can be improved by increasing the number of main truss,but the vertical natural vibration frequency are not significantly improved.The response of the emergency repair beam and the vehicle increase nonlinearly with the increase of vehicle speed,and the two responses jointly determine the maximum allowable traffic speed of the emergency repair beam.The traffic speed of the emergency repair beam can be improved with the increase of the number of main truss.

关 键 词：可展桥梁 铁路抢修梁 静力分析 模态分析 动力响应 最大通车速度 

分 类 号：U445.7[建筑科学—桥梁与隧道工程]