铁路预制节段拼装简支梁静动力性能试验研究  

Experimental Study on Static and Dynamic Properties of Railway Precast Segmental Assembling Simply Supported Girder

作　　者：李学斌 刘吉元 曾兵 杨心怡 董振升 柳墩利 姚淑芳 孙高伟 LI Xuebin;LIU Jiyuan;ZENG Bing;YANG Xinyi;DONG Zhensheng;LIU Dunli;YAO Shufang;SUN Gaowei(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Engineering Repair and Reinforcement Inspection Institute,China Academy of Building Research,Beijing 100013,China;Engineering Quality Supervision Center Quality and Safety Supervision Division,National Railway Administration,Beijing 100891,China;Track Maintenance Department,China Railway Taiyuan Group Co.Ltd.,Taiyuan 030013,China)

机构地区：[1]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [2]中国建筑科学研究院有限公司工程修复加固检测研究所,北京100013 [3]国家铁路局工程质量监督中心质量安全监督处,北京100891 [4]中国铁路太原局集团有限公司工务部,太原030013

出　　处：《铁道建筑》2023年第5期78-82,共5页Railway Engineering

基　　金：国能朔黄铁路发展有限责任公司基金(GJNY-22-85);建研院检测中心有限公司科研基金(20220126977130006)。

摘　　要：我国在新建铁路中建造了一些预制混凝土节段胶拼梁桥,多为48、56、64 m简支箱梁结构形式。通过48 m预制混凝土节段胶拼简支箱梁的静动载试验,对节段胶拼简支梁结构的受力性能进行研究。结果表明:梁体实际竖向抗弯刚度大于设计刚度,抗裂性能满足规范要求;梁体跨中截面和胶接缝截面的应变变化符合平截面关系;梁体实测竖向自振频率、阻尼比、竖向动挠度、动力系数、桥面板竖向加速度和支座横向位移均满足规范和设计要求;48 m节段胶拼梁的动力性能满足25T型客车以速度140 km/h和23 t轴重货物列车以速度120 km/h运行时相关验收标准的要求。通过在桥面施加均布荷载的方式可以实现节段拼装简支箱梁的静载试验。Some precast concrete segmental glued girder bridges have been built in new railways in China,mostly with 48,56,and 64 m simply supported box girder structures.Through the static and dynamic load tests of a 48 m precast concrete segmental glued simply supported box girder,the mechanical properties of segmental glued simply supported girder structure was studied.The results show that the actual vertical bending stiffness of the girder is greater than the design stiffness,and the crack resistance meets the specification requirements.The strain variations at the mid-span section and the glued joint section are in accordance with the plane section relationship.The measured vertical natural frequency,damping ratio,vertical dynamic deflection,dynamic coefficient,vertical acceleration of the bridge deck and transverse displacement of bearing meet the requirements of specifications and design.The dynamic performance of the 48 m segmental glued girder meets the requirements of standards for acceptance when 25T passenger trains run at 140 km/h and 23 t axle load freight trains run at 120 km/h.The static load test of segmental simply supported box girder can be realized by applying uniform load on the bridge deck.The research results may provide reference for the design and test of precast concrete assembling simple supported girders.

关 键 词：节段拼装梁 静载试验 动载试验 受力性能 刚度 抗裂性能 

分 类 号：U448.217[建筑科学—桥梁与隧道工程]