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.
出处
《长沙铁道学院学报》
CSCD
北大核心
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)
关键词
预应力混凝土
简支箱梁
先张法
后张法
prestressed concrete
simply supported box girders
pretensioning
posttensioning
