吊杆张拉程序对拱梁组合体系内力影响的分析

Influences on inner forces of hybrid bridge of arch and beam conducted by sequences of suspender tensions

以某拱梁组合体系为研究对象,研究不同吊杆张拉程序对结构内力的影响。分析表明:对称依次张拉会造成局部应力过大,但若根据结构受力情况,分次、逐级张拉,则可显著降低结构在张拉过程中的应力,保证结构的安全;对称交替张拉可以使结构在张拉过程中内力分布更均衡,对结构安全有利,在张拉设备等条件允许时可以考虑一次张拉到最终吊杆力。对这两类吊杆张拉程序在张拉施工中结构安全性的研究,可为同类工程提供参考.

A hybrid bridge of arch and beam was presented in this paper as an engineering case.Influences on inner forces of structures conducted by different sequences of suspender tensions were analyzed.Results show that： the gradual symmetry tension could make excessive stress variation in some sections of ribs,while it could reduce the stress variation apparently by more steps of suspender tensions,depending on the situation of the force on structure.In this way,the structure could be safer.The alternately symmetry tension makes the stress variation distribution more balanced in the structure during the course of tension,which was beneficial to safety.