基于动力有限元法对拱坝应力控制指标的分析  

Analysis of the stress control standard of arch dams by dynamic FEM

作　　者：常晓林[1] 李梦[2] 周伟[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,武汉430072 [2]中国水电顾问集团西北勘测设计研究院,西安710065

出　　处：《水力发电学报》2010年第5期52-57,共6页Journal of Hydroelectric Engineering

摘　　要：我国已建或拟建的高拱坝许多位于强震区,使得拱坝抗震分析中应力控制指标的制定成为十分重要的课题。本文探讨现有规范在动力方面的不足,并根据混凝土拱坝规范,利用静力作用下有限元等效应力控制指标的制定与拱梁分载法控制指标之间的关系,提出静动综合作用下有限元等效应力的控制指标。以大丫口拱坝实际工程为例,运用振型分解反应谱法计算了各种工况下坝体的地震静动综合响应,并运用本文提出的静动综合作用下等效应力控制指标进行校核,结果显示此标准具备较好的合理性及可行性。Many of the high arch dams constructed or to be constructed in China are located in the meizoseismal areas.Stress control standard for analysis of the earthquake-resisting safety of arch dams becomes important.This article discusses the shortage of seismic load calculation given by the existing design specifications,and through establishing a relationship of the control standard of the FEM static equivalent stress versus that of the trial-load method,puts forth a control standard of FEM equivalent stress under the combined action of static and dynamic loads.As a case study,the earthquake response of the Dayakou arch dam under various work conditions are analyzed by the response spectrum method of modal decomposition,and it is compared with the proposed standard.The results demonstrate that the proposed standard is reasonable and feasible.

关 键 词：水工结构 应力控制指标 动力有限元 拱坝 等效应力 

分 类 号：TV31[水利工程—水工结构工程]