节段预制箱梁体外预应力转向块受力性能分析  

Analysis on Mechanical Behavior of External Pre-stressed Steering Blocks of Precast Segmental Box Girder

作　　者：胡邦瑜 孙林 吴文杰 Hu Bangyu;Sun Lin;Wu Wenjie

机构地区：[1]重庆市市政设计研究院,重庆400020

出　　处：《重庆建筑》2018年第12期55-58,共4页Chongqing Architecture

基　　金：重庆市建设科技计划项目"节段预制拼装桥梁在市政工程应用关键技术研究与示范"(城科字2014第5-1号)

摘　　要：转向块设置于节段拼装桥梁体外预应力体系中,细部构造受力情况复杂。通过对华岩隧道西延伸段项目预制箱梁节段的组合式转向块进行有限元模拟分析,揭示该类型转向块在节段预制结构中的受力特性,通过改变底块高度和纵向长度、肋板厚度和横向尺寸、孔道半径和转角等,建立对比有限元模型,分析几何因素对转向块的受力影响,研究结论可供类似结构参考。The steering block is installed in the external pre-stress system of the segmental bridge,and the detail structure has complex stress conditions.Through the finite element modelling analysis on the modular steering blocks at the precast box girder segment of Huayan Tunnel West Extended Segment Project,the stress characteristics of this type of steering block in the precast segmental structure are unveiled.By changing the height and longitudinal length of the sole piece,the thickness and transverse size of the ribbed plate,the radius and the turning angle of the open framework,etc.,the finite element model is established and used to analyze the influence of geometric factors on the stress of steering blocks.The conclusions can be used as reference for similar structures.

关 键 词：节段箱梁 转向块 体外预应力 受力性能 

分 类 号：U443.21[建筑科学—桥梁与隧道工程] TU997[交通运输工程—道路与铁道工程]