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本文用三维有限中元法对混凝土拱坝进行非线性计算,计算中分别考虑了坝体、接缝和基岩材料非线性模型。以单元高斯点的应力值确定坝体开裂范围,同时采用压扁的坝体单元来模拟接缝和夹层。用交替迭代法和扩大初应力结点荷载的方法来求解非线性结点平衡方程组,从而提高收敛速度并缩短计算时间。用本文介绍的程序进行的马岭头水库周边缝拱坝的非线性计算,其结果与实测资料较相符。
In this paper, three-dimensional finite element method for nonlinear calculation of concrete arch dam, the calculation of the dam, seam and bedrock material nonlinear model were considered. The cracking range of the dam is determined by the stress value of the Gaussian point of the unit, and the flattened dam body element is used to simulate the joint and the interlayer. The alternating iteration method and the method of expanding the stress of initial stress nodes are used to solve the nonlinear node equilibrium equations to improve the convergence speed and shorten the calculation time. The nonlinear calculation of the arch dam around the Malingtou Reservoir by the program introduced in this paper is in good agreement with the measured data.