广元嘉陵江双线特大桥吊杆张拉研究

以主跨为172 m的广元嘉陵江双线特大桥为研究对象,按照不同张拉顺序及张拉方法组合成4种方案,运用正装迭代法,分析不同方案在二期恒载施加及吊杆张拉至相应目标索力过程中吊杆、拱及梁的力学特性,比较各方案在张拉至设计目标索力的张拉效果。研究表明:二期恒载应在初张拉完成后施加,且二次张拉法中吊杆、拱及梁的内力变化幅度影响较小、张拉效果好。

Tension Research on Guangyuan Jialing River Double-Line Large-Span Bridge' s Suspender

Guangyuan Jialing River double-line large-span bridge,whose main span is 172 meters,is taken as the research object.Four schemes are proposed in accordance with different stretching sequences and drawing methods.Using the calculation method of forward iteration,the mechanical properties of the arch and girder are analyzed among different schemes after the second phase of constant load applied and the boom put pressure on relevant targets force,and the drawing effects of various schemes in tension to designed goal of boom internal force are compared.Research shows that: second phase constant load should be applied after the completion of the initial tension,and drawing effect of secondary tension method is excellent,during which the inner force changing extent of boom,arch and beam would be less.