为研究双边钢箱钢-混组合梁的优化设计,以某双塔双索面自锚式悬索桥的宽幅双边钢箱钢-混组合梁为研究对象,建立实体模型及杆系模型,分析横梁及次纵梁构造参数的改变对组合梁受力性能的影响,提出各构件合理优化方案。研究结果表明:增大次纵梁间距,对结构影响较小,可优化组合梁结构;减小横梁上翼缘板厚度有助于改善横梁下翼缘板及腹板受力,达到组合梁优化目的;上翼缘板板厚从25mm减小至20mm,同时下翼缘板板厚从20mm增加至25mm,横梁下翼缘板应力得到明显改善,即横梁下翼缘板板厚大于横梁上翼缘板板厚对组合梁结构更有利。

In order to study the optimization design of double-sided steel box steel-concrete composite beam, the wide double-sided steel box steel-concrete composite beam of a double-tower double-cable-plane self-anchored suspension bridge was taken as the research object. The entity model and the bar system model were established to analyze the influence of the change of the structural parameters of the crossbeam and the secondary longitudinal beam on the mechanical performance of the composite beam and propose a reasonable optimization scheme for each component. The results show that increasing the spacing of secondary longitudinal beams has little effect on the structure and can optimize the composite beam structure. Reducing the thickness of the upper flange plate of the beam is helpful to improve the stress of the lower flange plate and the web of the beam so as to achieve the optimization of the composite beam. When the thickness of the upper flange plate decreases from mm to mm and the thickness of the lower flange plate increases from mm to mm, the stress of the lower flange plate of the beam is obviously improved, implying that the thickness of the lower flange plate of the beam is greater than that of the upper flange plate of the beam, which is more favorable for the composite beam structure.