考虑摩擦约束时面板温度应力的有限元分析

本文介绍了用有限元法模拟接触摩擦的方法，并计算分析了堆石体的摩擦约束对面板温度应力的影响。研究分析表明，摩擦约束引起的平均拉应力最大值出现在靠近趾板的中下部，当摩擦角小于坝坡角时，面板内不会产生贯穿的拉应力，摩擦角大于坝坡角时，拉应力分布的数值存在上限，达到上限值之后，板内平均拉应力不再随温度变化而增大。提高坝坡平整度，减小堆石体对面板的约束是避免贯穿裂缝的有效措施。

Finite element analysis for thermal stress of concrete slabs with friction constraint

This paper presents the procedure for simulating the contact friction by using FEM. The effect of frictional constraint of rock dump on thermal slabs is analyzed. The result shows that the maximum value of the average tensile stress occurs to the lower part of the dam. Penetrating tensile stress will not be yield when the friction angle is less than the dam slope, whereas a maximun value of the tensile stress exists when the friction angle is larger than the dam slope. When the tensile stress reaches the maximum value the tensile stress in the slabs keeps unchanged in spite of the temperature drop. It is an effective measure to avoid the occurence of penetrating carck by enhancing the flatness of the dam slope and reducing the restriction of the rock dump to the slabs.