高速铁路先张预应力混凝土简支箱梁力学效应分析  

Mechanics Domino Effect Analysis of Pretensioning and Posttensioning Prestressed Concrete Simply Supported Box Girders in High-speed Railway

作　　者：曾毅军[1] 凌汉东[1] 盛兴旺[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075

出　　处：《长沙铁道学院学报》2003年第4期17-23,共7页Journal of Changsha Railway University

基　　金：铁道部科技发展计划项目(2002G007)

摘　　要：结合我国高速铁路的需要,通过有限元分析,以24m跨度先、后张梁为分析对象,对先张混凝土箱梁进行应力、刚度、剪力滞后、畸变、翘曲、支座脱空效应、局部效应等力学性能的分析,并与后张梁进行对比.论证了先张箱型梁在高速铁路中应用的可行性,分析了其剪力滞效应、有效计算宽度横向应力、畸变、翘曲及传递长度影响等力学效应规律,供箱梁设计时参考.In this paper,taking 24 m span pretensioning,posttensioning prestressed beam as research object,the author analyses the stress of pretensioning prestressed concrete box girders,stiffness,shear lag,aberration,warp,unequalizing support and local effect through the finite element method,comparing with those of posttensioning prestressed concrete box girders.Applied feasibility of pretensioning box girders are argued in high-speed railway.The orderlines of the structure's mechanical effects about shear lag,effective flange width,transverse stress,distortion,warp and transfer length etc are analysed.It provides a reference for design.

关 键 词：预应力混凝土 简支箱梁 先张法 后张法 

分 类 号：U488.35[交通运输工程—载运工具运用工程]