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采用有限元法计算拱坝应力时,在拱坝近基础部位存在明显的应力集中,这对计算结果的评价带来了困难。为明确应力集中部位的真实应力水平,以大型分析软件ANSYS为平台,建立了拱坝三维有限元模型。针对同一模型,在相同荷载作用下,分别采用混凝土单轴强度准则(线性有限元法)和混凝土多参数强度准则(非线性有限元法)进行计算,并分析了非线性有限元法计算中参数ft值的敏感性。结果表明,两种方法所得的拱坝应力分布规律基本一致,而非线性有限元法可描述坝体在应力水平较大部位是否开裂。
When using finite element method to calculate the stress of arch dam, there is obvious stress concentration near the foundation of arch dam, which brings difficulties to the evaluation of calculation results. In order to clarify the true stress level of the stress concentration area, a three-dimensional finite element model of arch dam is established by the large-scale analysis software ANSYS. For the same model, the uniaxial strength criterion (linear finite element method) and the multi-parameter concrete strength criterion (non-linear finite element method) are used to calculate the parameters of the nonlinear finite element method under the same load respectively. ft value sensitivity. The results show that the stress distribution of the arch dam obtained by the two methods is basically the same, while the non-linear finite element method can describe whether the dam is cracked in the larger stress level.