【摘要】 研究目的:针对宜万线宜昌长江大桥初步设计中横向受力不利的特点,提出4类有效的构造设计措施。通过对横隔板(横梁)的设置位置、构造尺寸等参数的敏感性分析,揭示构造措施的作用机理和效率。根据参数研究成果,提出现行最优构造设计方案,并通过仿真分析验证其可靠性,为同类桥型设计提供参考。研究结论:(1)采用横隔板方案的弹性支承效应对箱梁断面整体受力有一定影响,而采用横梁方案能够简单、直接地改善顶板应力状态。施工设计时应结合二者构造措施的长处,提出组合构造设计方案,全面改善箱梁整体受力性能。(2)从吊杆轴力变化规律可以看出,各计算方案下吊杆轴力基本无变化。这表明,横隔板(横梁)的设置只改变箱梁的横向刚度,对竖向刚度的影响极小。再次验证了横隔板的弹性支承效应只改变箱梁内部的传力途径,对梁、拱的刚度比例无明显影响。更多还原

【Abstract】 Research purposes: The four improved design programs were proposed for the characteristics of unfavorable transverse stress in preliminary design of Yichang Yangtze River Bridge.By analyses of the influences of design parameters such as the setting position and figuration size of the diaphragm and transverse beam,the mechanisms and efficiencies of each program were revealed comprehensively.Based on the result of parameter analysis,an optimum program was offered and its mechanism was verified thoroughly.Research conclusions:(1) The elastic support of the diaphragm affects the whole load-bearing capacity of the section of box beam to some extent and the transverse beam can easily and directly improve the load-bearing capacity of the roof,so with consideration of the advantages of each design program,an integrated program should be made to improve the load-bearing capacity of box beam.(2) It can be seen from the change law of axial force of boom that the axial force of the boom in all calculation programs has no change basically.It shows the diaphragm or transverse beam installation only changes the transverse rigidity of box beam and has a little influence on the vertical rigidity of box beam,and it also verifies again the elastic support effect of the diaphragm only changes the force transfer way in the box beam and has no obvious influence on the rigid ratio of the beam and arch.更多还原