拆装式桁梁新型钢枕桥面竖向荷载分配机制  

Vertical load distribution mechanism of new steel sleeper bridge deck used for assembled truss beam

作　　者：孙志星[1,2] 陈士通[1,2] 赵曼 许宏伟 陈哲心 SUN Zhi-xing;CHEN Shi-tong;ZHAO Man;XU Hong-wei;CHEN Zhe-xin(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Safety Engineering and Emergency Management,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Jinan Kingyue Highway Engineering Company Limited,Jinan 250101,China)

机构地区：[1]石家庄铁道大学,省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,石家庄050043 [2]石家庄铁道大学安全工程与应急管理学院,石家庄050043 [3]石家庄铁道大学土木工程学院,石家庄050043 [4]济南金曰公路工程有限公司,济南250101

出　　处：《吉林大学学报（工学版）》2023年第6期1669-1676,F0003,共9页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家重点研发计划项目(2021YFB2600605,2021YFB2600600);省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自主项目(ZZ2020-16).

摘　　要：为解决拆装式桁梁既有桥面木枕储备量严重不足、制约其应急使用的问题,研发了一种新型钢枕桥面。为探明新型钢枕桥面用于拆装式桁梁时的竖向荷载分配机制,开展了4 m节段足尺试验及有限元仿真分析研究,在仿真和试验对比研究的基础上,基于实桥有限元模型探讨了加载位置、钢轨刚度、弦杆刚度、钢枕刚度、桁梁竖向刚度等因素对竖向荷载分配的影响规律。结果表明:竖向荷载在钢枕上的实际分布范围较理论计算值大;位于弦杆节点位置的钢枕较位于节间位置的钢枕所承受的荷载比例要大,且支撑刚度越大,所分担的荷载比例越大;单枕荷载极值占比随钢轨刚度的增大而减小,随钢枕刚度的增大而增大,而与桥跨结构竖向刚度关系很小;桁架梁弦杆刚度增大会减弱加载位置对单枕荷载极值占比的影响。新型钢枕可适用于拆装式桁梁对我国铁路常用钢轨线路中16~32 m跨桥梁进行抢通等应急使用的桥面,为拆装式桁梁的抢修抢险提供基础设施保障,并可提高抢通速度。In order to solve the current situation that the reserve of existing bridge wooden sleepers is seriously insufficient and thus restricts the emergency use of assembled truss beams,a new type of steel sleepers instead of wooden sleepers was studied.To find out the vertical load distribution mechanism of the new steel sleeper used for assembled truss beam,full scale test of 4 m section and finite element simulation analysis were carried out.According to comparison between simulation and test,the influence of loading position,rail stiffness,chord stiffness,steel sleeper stiffness,and bridge vertical stiffness on vertical load distribution was discussed according to real bridge finite element model.It can be concluded that the actual distribution range of vertical load on the bridge sleepers is larger than the theoretical value.The steel sleeper at the position of chord joint bears larger proportion of load than the steel sleepers at the position between chord joints,and the stronger the support stiffness is,the larger the proportion of load is borne.The load extremum ratio of single sleeper borne decreases with the increase of rail stiffness,increases with the increase of steel sleeper stiffness,and has little relationship with the vertical stiffness of bridge structure.The increase of chord stiffness weakens the influence of loading position on the load extremum ratio of single sleeper born.The new type of steel sleeper can be applied to the deck of the assembled truss beams which are used to repair 16~32 m span bridges in common steel rail lines of Chinese railway.It can provide infrastructure support for the emergency repair of the assembled truss beams,and improve the reopened speed.

关 键 词：防灾减灾工程 钢枕 明桥面 荷载分配 拆装式桁梁 

分 类 号：U213.3[交通运输工程—道路与铁道工程]