钢箱拱肋缆索吊装中几何非线性影响的分析

Analysis of Geometric Nonlinear Influence on the Cable Erection of the Steel Box Arch Ribs

在钢箱拱肋的缆索吊装中,由于索的垂度效应、大位移效应以及梁—柱效应等几何非线性因素的影响,致使拱肋的位移以及内力与实际情况存在一定偏差。为了减小合龙拱轴线线形误差,确保桥梁结构施工安全,通过考虑与不考虑几何非线性两种情况的分析对比,提出拱肋缆索吊装过程中可视具体情况给拱肋节段赋予一定的预抬量以抵消几何非线性作用使拱肋所产生的下沉量。

During erection of cables on the steel box arch rib, the displacement and internal forces of arch ribs may deviate from actual situation due to the impact of geometric nonlinear factors such as the effect of cable sag, large displacement and beam column structure. To minimize the linear deviation of the arch axis and ensure construction safety, comparative analysis is made of two situations, i.e. considering the geometric nonlinearities or not, with the proposal that some section of the arch rib be lifted accordingly during erection of cables to counteract its sagging due to the geometric nonlinear impact.