摘要
研究目的:随着我国“交通强国”战略的进一步推进,交通建设中交叉线路越来越多,转体桥梁的施工形式使用越来越频繁。转体桥梁广泛应用于跨越已有铁路的工程建设中,但目前对于转体桥梁在既有铁路列车荷载下的结构振动空间响应规律和传递机制的研究相对较少。本文以石嘴山特大桥(637号墩、638号墩)为依托,利用振动加速度传感器测试在仅球铰接触且大悬臂状态下,转体桥受普速列车荷载下结构响应数据,对转体桥梁结构的动态加速度响应、动态位移响应及加速度时程信号的振动希尔伯特能量谱进行分析。研究结论:(1)在既有线普速列车荷载下转体桥梁下承台要先于上承台达到竖向加速度峰值点,且其峰值大于上承台;(2)结构加速度幅值在转体桥梁梁体向梁端的传递过程中出现放大现象,且加速度时程曲线会出现“往复式”波动,表明振动波与固有频率发生共振,加速度响应峰值分布曲线在空间上呈“V”形对称分布;(3)桥梁梁端产生的动态竖向位移响应相对较大,梁体各测点的竖向位移响应峰值呈现“W”形对称分布;(4)转体球铰对振动波的中、高频段具有明显的滤波减振作用;(5)振动波在梁端出现了较为明显的驻波效应,且中、高频段的振动波衰减较快,低频段的振动波是引起转体桥梁梁体振动的主要原因;(6)本研究成果可为临近既有线转体桥梁的设计与建设提供一定的理论参考。
Research purposes:With the further advancement of China's strategy to become a transportation powerhouse,the proliferation of intersecting routes in transportation infrastructure is on the rise,and the construction method of rotating bridge structures is becoming increasingly prevalent.These rotating bridge are widely used in engineering projects across existing railway lines.However,there is currently a relative scarcity of research concerning the structural vibration spatial response patterns and transmission mechanisms of rotating bridges under the load of existing railway train traffic.Based on the Shizuishan Super-large Bridge(637#and 638#),this paper utilizes vibration acceleration sensors to conduct tests on the structural response data of rotating bridges under the sole contact of spherical hinges and in a state of large cantilever,and analyzes the dynamic acceleration response,dynamic displacement response,and the vibration Hilbert energy spectrum of the rotating bridge structure.Research conclusions:(1)Under the normal speed train load of the existing line,the lower pile cap of the swivel bridge should reach the vertical acceleration peak point before the upper pile cap,and the peak value is greater than the upper pile cap.(2)The acceleration amplitude of the structure is amplified during the transmission from the bridge deck to the beam end of the swivel bridge,and the acceleration time-history curve will show"reciprocating"fluctuations,indicating that the vibration wave resonates with the natural frequency,and the acceleration response peak distribution curve is spatially"V"symmetrical distribution.(3)The dynamic vertical displacement response generated at the end of the bridge is relatively significant,and the peak vertical displacement responses at various measurement points along the beam exhibit a symmetric"W"shape distribution.(4)The swivel spherical hinge has obvious filtering and vibration reduction effect on the middle and high frequency bands of vibration waves.(5)The vibration wave has obvious standing wave effect at the beam end,and the vibration wave in the middle and high frequency bands attenuates rapidly.The vibration wave in the low frequency band is the main cause of the vibration of the rotating bridge beam.(6)The research results can provide a theoretical reference for the design and construction of swivel bridges near existing lines.
作者
赵守全
刘旭
窦顺
朱红兴
杨学虎
韩侃
ZHAO Shouquan;LIU Xu;DOU Shun;ZHU Hongxing;YANG Xuehu;HAN Kan(Northwest Research Institute Co.Ltd.of CREC,Lanzhou,Gansu 730070,China;College of Resources and Environmental Engineering,Key Laboratory of Karst Georesources and Environment,Ministry of Education,Guizhou University,Guiyang,Guizhou 550025,China;Gansu Tieke Construction Engineering Consulting Co.Ltd,Lanzhou,Gansu 730070,China;China Railway Beijing Engineering Bureau Group Sixth Engineering Co.Ltd,Shenyang,Liaoning 110000,China)
出处
《铁道工程学报》
EI
CSCD
北大核心
2023年第11期50-57,共8页
Journal of Railway Engineering Society
基金
国家重点研发计划(2018YFC1504901)
甘肃省青年科技基金(23JRRA1364)
中铁北京工程局集团有限公司(包银铁路项技术(字2021))。
