【摘要】 基于3组钢平管桥负弯矩试验结果进一步比对规范计算的合理性,同时验证非线性有限元模拟的准确性,对20个自承式平直型钢管桥模型展开参数分析。研究支承角度、管壁厚度、支承长度、钢管直径等参数对支座处钢管环向应力的影响。并将计算结果与现行管桥设计规程推荐的计算方法进行对比。研究结果表明:自承式管桥的支承断面为结构设计的控制性断面,按现行设计规程设计大直径管桥时,有较大的安全储备。最后,基于参数分析,回归给出最大环向弯矩计算公式,与有限元结果吻合良好。更多还原

【Abstract】 Based on three groups of negative bending moment test results of steel flat pipe bridge, the article further compares the rationality of standard calculation, also validates the accuracy of nonlinear finite element simulation and analyzes the parameters of 20 self-supported flat steel pipe bridge models. The article studies the influence of supporting angle, pipe wall thickness, supporting length, steel pipe diameter and etc. on the hoop stress of steel pipe at support. The article compares the calculation result with the calculation method recommended by current pipe bridge design regulation. The study result shows that the supporting section of self-supported pipe bridge is the structure design of controlled section. The large-diameter pipe bridge with a large safety reserve is designed according to the current design regulation. Based on the parameter analysis,the largest hoop bending moment computation formula is given and is better agreed with the finite element result.更多还原