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本文根据拱坝结构和应力分布的特点,假设坝段缝、边缘接触面和新老混凝土交接面是拱坝的几个强度薄弱面.由于这些面的开裂引起坝体应力的重分布.在有限元计算时采用六节点等参数单元,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坝体与地基的接缝.在拱坝非线性分析基础上探讨了拱坝极限承载能力的估算方法,由于接缝单元开裂后应力转移缓慢且拱坝破坏时坝体单元开裂很多,单纯用初应力法或变劲度迭代法已不能满足计算的需要,本文提出用交替迭代法可以得到较好的效果.
According to the characteristics of arch dam structure and stress distribution, it is assumed that the joints between the dam section, the edge and the interface between the new and old concrete are the weaknesses of the arch dam. Because of the redistribution of stress in the arch dam, Element calculation uses six nodes and other parameters of unit Gaussian point of stress to determine the scope of the dam cracking, and the use of flattened dam body element to simulate the dam and foundation of the joint. For the method of estimating the ultimate bearing capacity of arch dam, the initial stress method or the iteration method of variable stiffness can not satisfy the calculation requirements because of the slow stress transfer after the cracking of the joint element and the cracking of the arch dam. Alternate iterative method can get better results.