模拟施工过程的拱坝结构应力分析

Stress Analysis of a High Arch Dam Considering Construct Step

摘要: 针对某高拱坝利用有限单元法计算了自重整体施加、按梁施加、逐层施加三种情况，以及水压力和温度荷载作用下坝体的线弹性和非线性应力和变形，以等效应力及塑性应变来分析自重施加方式对坝体应力的影响。线弹性有限元计算结果表明，对于高拱坝自重不同的施加方式对坝底和坝肩的应力影响很大；非线性有限元分析也表明，自重不同的施加过程对坝体的塑性应变及塑性应变能也有很大的影响。所以，高拱坝实际的受力必须考虑坝体混凝土的浇筑过程，其计算结果才能客观地评价坝体的安全性，从而提高设计的可靠性。

Abstract: The stress and deformation of a high arch dam are calculated under the self-weight, water pressure and temperature load by linear and nonlinear finite element method. The self-weight is applied according to three ways: bearing by whole dam, bearing by beam and bearing step by step. The equivalent stress on dam-foundation interface and plastic strain, and the plastic energy of the arch dam are used to evaluate the influence of self-weight loading ways. The results of finite element method show that self-weight loading ways greatly affect the stress distribution, plastic strain and plastic energy of the arch dam. Thus, the dam construction steps must be considered and the actual stress status of dam can be used to judge the safety of dam.