后张法预应力混凝土箱梁张拉次序的有限元分析

Finite element analysis of post tensioning prestressed concrete box girder

预应力的张拉是预应力混凝土结构施工中的一个重要环节。针对某双线铁路就地浇筑的预应力混凝土整体箱梁,采用MIDAS/CIVIL结构分析软件对该梁施工中预应力筋的分批张拉过程进行了仿真分析。从中探讨了在不同张拉次序下箱梁的应力、变形的变化规律,并通过对仿真计算结果进行分析比较,给出了预应力筋的合理张拉次序,可为同类工程的设计与施工提供参考。

The prestressed tension is a key link in construction of prestressed concrete structure. In this paper, the prestressed concrete box girder casted - in - site on a double - track railway line is simulated, using the software of MIDAS/CML. The variation of the box girder＇s stress and strain is discussed according to the results of the different tensioning sequence. And according to the comparison of the simulation results, a reasonable tensioning sequence is given. It will provide reference for the design and construction of similar projects.