高速铁路先、后张预应力混凝土简支箱梁力学效应对比分析

Mechanics domino effect analysis of pretensioning and posttensioning prestressed concrete simply supported box girders in high-speed railway

结合我国高速铁路的需要,通过有限元分析手段,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。

Combines with the need of high-speed railway, in the paper, it takes 24m-span pretensioning, posttensioning prestressed beam as the research object, stress of pretensioning prestressed concrete box girders, stiffness, spear lag, aberration, warp, unequalizing support and local effect are analysed through the finite technology. And in contrast with those of posttensioning prestressed concrete box girders. Discussion is made on the applied feasibility of pretensioning box girders in high-speed railway.