地震作用下拱坝有限元等效应力的计算

目前拱坝等效应力仅被应用在静力作用下的计算分析中,而且规范中没有明确规定动力作用下等效应力的应力控制标准。笔者依照相关混凝土拱坝设计规范补充计算了有限元等效应力的控制标准,以大丫口水电站混凝土拱坝为例,把有限元等效应力的计算与动力作用下的应力分析结合起来,用时程分析法计算得到动力作用下的应力最大值,进而得到静动综合作用下的应力最大值,与推导出的应力控制标准相比较,进行应力评价。

Finite element equivalent stress calculation of arch dam under seismic action

The equivalent stress of arch dam is only applied in calculation analysis in case of static action,and in the specification no stress control criterion has been clearly specified for the equivalent stress under dynamic action.Based on relative design standard of concrete arch dam,this paper complementarily calculates the control criteria of finite element equivalent stress.Taking the arch dam of Dayakou hydropower project for example,the calculation of finite element equivalent stress is combined with analysis of stress under dynamic action,the maximum value of stress under dynamic action is obtained by the time-history analysis method,and then the maximum value of stress under combined static and dynamic actions is got.By comparing to the derived stress control criterion,the stress is evaluated.