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文章针对高墩大跨预应力混凝土连续刚构桥的高墩稳定性及大体积混凝土施工过程中的温度应力等问题,基于非线性空间有限元的基本理论,以野三河大桥为工程背景,利用大型有限元通用软件ANSYS对其进行了详细的计算分析,对其抗风稳定性进行了非线性计算分析。计算结果表明,考虑几何非线性,静风荷载对桥梁最大悬臂状态的稳定性影响较大,成桥状态影响较小,同时验证了该特大桥抗风稳定性满足要求;大体积混凝土内部温度场及仿真应力场的计算结果与实测结果进行比较,结果显示所建立的有限元分析模型可以较好地计算混凝土施工时的温度场与温度应力。
In this paper, based on the basic theory of nonlinear space finite element method and the Ye San San Bridge as the engineering background, aiming at the problems of high pier stability of high pier large span prestressed concrete continuous rigid frame bridge and temperature stress during mass concrete construction, The large-scale finite element general software ANSYS has carried on the detailed computation analysis to it, has carried on the non-linear computation to the wind-resistant stability. The calculation results show that considering the geometrical nonlinearity, the static wind load has a great influence on the stability of the maximum cantilever state of the bridge, and has little effect on the state of the bridge. Meanwhile, the stability of the wind-resistant bridge is verified to meet the requirements. The internal temperature field of the mass concrete The simulation results show that the finite element analysis model can well calculate the temperature field and temperature stress of concrete during construction.