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为了计算体外预应力波纹钢腹板组合箱梁桥的极限抗弯承载力,针对其构造特点,考虑波纹钢腹板与顶底板混凝土剪力连接键剪切滑移的影响,推导了波纹钢腹板预应力箱梁极限抗弯承载力计算公式。滑移应变增大了顶底板的应变和截面曲率,可以通过附加弯矩考虑界面滑移对极限抗弯承载力的影响;在分析体外预应力钢筋与梁体变形协调关系的基础上,得到了体外预应力筋的应力增量,推导并总结了应用塑性铰法计算波纹钢腹板体外预应力组合箱梁极限抗弯承载力的步骤,并通过模型试验对该方法进行了验证。试验与理论分析的对比结果表明:考虑剪力连接键剪切滑移会减小极限抗弯承载力;推导得出的公式的计算结果优于同类现有方法,与实测数值接近,可用于同类箱梁设计的参考。
In order to calculate the ultimate flexural capacity of externally prestressed corrugated steel webs with box girder bridges, considering the structural features of the corrugated steel webs and considering the influence of the shearing and slippage of the shear bond between the corrugated steel webs and the top and bottom concrete slabs, Calculation formula of ultimate flexural capacity of prestressed box girder. The effect of interface slip on the ultimate flexural capacity can be considered by the additional bending moments. Based on the analysis of the coordination relationship between the external prestressing tendons and the deformation of the beam body, The procedure of calculating the ultimate flexural capacity of prestressed composite box girder with corrugated steel webs by using plastic hinge is deduced and summarized. The method is validated by the model test. The experimental results show that considering the shearing slip of shear connectors, the ultimate flexural capacity will be reduced. The calculated results obtained by the derivation are superior to the existing methods and close to the measured values, Box girder design reference.