跨座式单轨刚构体系钢轨道梁设计与分析

Design and Analysis of Steel Track Girder in Rigid-frame System Bridge of Straddle Monorail Transit

跨座式单轨交通桥梁在跨越较大路口时,对桥梁的跨越能力要求较高。本文尝试利用刚构体系的多跨变截面钢轨道梁解决桥梁的跨越问题(40m~60m)。以某正在兴建的跨座式单轨交通为背景,对跨座式单轨刚构体系钢轨道梁的静动力特性和钢轨道梁的关键设计参数进行系统的分析研究。研究表明:刚构体系钢轨道梁具有较大的横向刚度;梁高及边跨长度这两个设计参数对结果影响最大;利用精细化模型进行弹性屈曲分析,根据结果判断结构的薄弱部位并进行加强、调整,可有针对性地提高整体结构的安全储备。

When the straddle monorail traffic bridge crosses a large intersection,higher requirements on the spanning capacity of the bridge is needed.In this paper,the multi-span rigid-frame system steel track girder with variable-section was analyzed to cross 40~60 meters.Based on the construction of one Straddle monorail transit,the static and dynamic characteristics,the key design parameters of the steel track girder in rigid-frame system were systematically analyzed.The research showed that the steel track girder in rigid-frame system had large lateral stiffness.Two design parameters,beam height and side span length,had the greatest influence on the results.Based on elastic buckling analysis with a refined model,the weak parts of the structure could be judged,adjusted and strengthened,therefore,safety margin of the whole structure could be pertinently improved.