超高性能混凝土应用于铁路组合梁结构的设计研究  

Research on Applying UHPC to Composite Girder of Railway Bridge

作　　者：文子豪 周金枝[1] 毛伟琦 田启贤[2,3] WEN Zi-hao;ZHOU Jin-zhi;MAO Wei-qi;TIAN Qi-xian(Hubei University of Technology, Wuhan 430068, China;State Key Laboratory for Health and Safety of Bridge Structures, Wuhan 430034, China;China Railway Major Bridge Engineering Group Co. , Ltd. , Wuhan 430050, China)

机构地区：[1]湖北工业大学,湖北武汉430068 [2]桥梁结构健康与安全国家重点实验室,湖北武汉430034 [3]中铁大桥局集团有限公司,湖北武汉430050

出　　处：《桥梁建设》2021年第3期72-76,共5页Bridge Construction

摘　　要：为研究将超高性能混凝土(UHPC)应用于铁路组合梁结构的适用性,以温福铁路白马河特大桥为背景,对64 m跨径的双线铁路简支梁结构开展UHPC组合截面设计研究。提出底板及腹板采用UHPC材料、顶板采用普通混凝土材料的组合箱形断面形式,通过有限元软件建立双层空间梁单元模型对UHPC组合梁进行计算分析;提出普通混凝土桥面板先预制并养护后再与UHPC腹板、底板结合成一体的UHPC组合梁施工方案,并对组合梁的收缩徐变效应进行计算分析。结果表明:同跨径的UHPC组合简支梁相比于普通混凝土梁可减少约30%的自重,可有效减少桥梁下部结构的工程量及运架梁的费用;所提出的UHPC组合梁施工方案可有效改善组合截面交界面的收缩徐变应力。The Baimahe River Bridge of Wenzhou-Fuzhou Railway is taken as a case to study the applicability of ultra-high performance concrete(UHPC)in composite girder of railway bridge.The types of UHPC composite girder for the 64 m-span simply-supported structure accommodating two rail tracks are analyzed.A composite girder with UHPC base slabs and webs as well as normal concrete top slabs is proposed and verified by double-layer spatial beam element finite element analysis.It is recommended that the normal concrete slabs be prefabricated and cured first and then combined with UHPC webs and base slabs to be the UHPC composite girder.The shrinkage and creep effect of the composite girder was calculated and analyzed.The results show that by using UHPC,the self-weight of the simply-supported girder can be reduced by about 30%,which also leads to the reduction of construction volume of the substructure and the delivery and erection costs of girders.The UHPC composite girder construction scheme proposed can effectively improve the interface shrinkage and creep effect in the composite cross-section.

关 键 词：超高性能混凝土 组合简支梁 结构设计 施工 收缩徐变 

分 类 号：U448.216[建筑科学—桥梁与隧道工程] U448.13[交通运输工程—道路与铁道工程]