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梁拱组合桥梁由拱、系梁和吊杆组合,组成构件多且各构件受力特性迥异,给力学分析带来很大困难.文章通过引入吊杆力相等、等效膜张力等假设,采用能量变分原理推导单跨下承式简支梁拱组合桥梁拱肋荷载分担比、主梁和拱肋跨中挠度的计算公式,从力学本质上揭示和分析不同结构设计参数对拱式组合体系桥梁整体受力性能的影响.可为设计人员在概念设计阶段确定较合理的结构参数提供理论依据.
The beam-arch composite bridge is composed of an arch, a tie beam and a boom, which has many components and different stress characteristics of the components, which brings great difficulties to the mechanical analysis. By introducing the assumption that the boom force is equal and the equivalent film tension is adopted, Energy variational principle to deduce the load-sharing ratio of arch ribs, the formula of mid-span deflection of main girder and arch rib in single-span under-supported simply supported beam arch bridges, reveal and analyze the structural design parameters from different mechanics to the arch combination system The whole force of the bridge can influence the performance of designers in the conceptual design stage to determine the more reasonable structural parameters provide a theoretical basis.