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通过引入坦拱、吊杆力相等、等效膜张力等假定,用力学方法推导了下承式3跨连续梁拱组合桥梁拱肋荷载分担比、主梁跨中挠度、拱肋跨中挠度的计算公式。通过改变结构参数,建立了多个桥梁模型,并将各模型下公式计算结果与有限元计算结果进行对比,验证了计算公式的正确性。为了使二者的计算结果更加接近,通过误差分析,对公式进行了修正。拱肋荷载分担比、主梁跨中挠度、拱肋跨中挠度的计算误差基本在3%、10%、20%以内。最后还通过参数分析,探讨了各相关结构参数对拱肋荷载分担比的影响。本文计算公式和参数分析结果对同类桥型的初步设计有很大的指导作用。
By introducing the assumption of arch arch, the same boom force, the equivalent film tension and so on, the load sharing ratio of the arch rib of the 3-span continuous beam arch bridge with composite span, the mid-span deflection of the girder, Calculation formula. By changing the structural parameters, a number of bridge models are established, and the calculation results of the formulas under each model are compared with those of the finite element analysis to verify the correctness of the calculation formulas. In order to make the calculation results of the two closer, the formula is corrected by error analysis. The calculation error of arch rib load sharing ratio, mid-span deflection of center girder and mid-span deflection of arch rib is basically within 3%, 10% and 20%. Finally, through the parameter analysis, the influence of the relevant structural parameters on the load sharing ratio of the arch rib was discussed. The calculation formulas and parameter analysis results in this paper have a great guiding effect on the preliminary design of similar bridge types.