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钢与混凝土结合梁斜拉桥的主梁须承受强大的轴压力与局部弯矩,施工完成时恒载引起的主梁内力,由混凝土桥面板与钢梁共同承担,由于混凝土徐变将调整其间的分配比例,本文用换算弹性模量法对结合梁推导了徐变内力重分布计算公式,并研究了含筋率变化对徐变内力重分布的影响,提出了增加桥面板纵向钢筋含筋率来降低混凝土徐变对钢梁的影响,以减轻混凝土桥面板与钢梁间传递剪力的栓钉的负荷,并通过算例以说明这种措施的实际效果。
Steel and Concrete Bridges The main girders of cable-stayed bridges are subject to strong axial compressive forces and local bending moments. The main girder internal forces caused by the dead loads at the completion of construction are shared by the concrete bridge slabs and the steel girders. Due to the concrete creep, In this paper, the formula of creep internal force redistribution is deduced by the method of elastic modulus conversion, and the effect of variation of reinforcement ratio on creep internal force redistribution is studied. To reduce the influence of concrete creep on the steel girder to reduce the load of the peg which transmits the shear force between the concrete bridge deck and the steel girder. An example is given to illustrate the practical effect of this measure.