吊杆张拉程序对外倾单肋钢拱桥拱肋内力影响分析

Influence of Sequences of Suspender Tensions Upon Inner Force of Arch Rib of Steel Arch Bridge with Single Extraversive Rib

以某外倾单肋异形钢拱桥为研究对象,采用有限元计算程序Midas/Civil建立空间有限元模型,对吊杆的张拉顺序、张拉次数对拱肋内力及拱肋吊点位移的影响进行了对比分析计算。考虑结构内力均衡与安全,兼顾施工方便性和经济性,得到了较为合理的张拉方案Ⅲ:交替对称一次张拉至最终吊杆力的张拉程序。

A finite element model was established by using Midas / Civil to study special-shaped steel arch bridge with single extraversive rib and to analyze the influence of tension order and number of tensions upon the inner force and displacement of the hoisting point. Considering internal force balance,safety,convenience and economy,a reasonable tensioning scheme was proposed that suspenders be tensioned alternately and symmetrically to final tensile force in one time.