基于直接内力法的拱坝建基面等效应力分析  

Equivalent stress analysis for the base surfaces of arch dams by direct internal force method

作　　者：杨强[1] 刘福深[1] 周维垣[1] 

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《水力发电学报》2006年第1期19-23,共5页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金(50279016);973课题(2002cb412708)

摘　　要：本文提出适合分析拱坝建基面等效正应力的直接内力法。在目前有限元的水平上,该方法可以相对准确地计算建基面上的应力。该方法通过有限元计算的应力结果计算建基面上结点的内力,将建基面沿高程依次分成若干段曲面,对每段曲面均采用等效矩形进行近似,分别求解各等效矩形截面的内力。根据材料力学公式可以计算建基面上任意点的线性化等效正应力。工程实例分析说明了该方法的合理性和正确性。The direct internal force method of equivalent normal stress analysis for the base surfaces of arch dams is presented in this paper. On the present level of FEM, the internal forces on the base surfaces can be computed accurately by this method. Constraint nodal forces on the base suface are obtained from the stress results of FEM. The surface is divided into several parts according to the elevations, all those parts are approximated by the equivalent rectangles, then the internal forces are derived on the equivalent rectangles. The linear equivalent normal stresses of the base surface can be easily calculated by the formulas of material mechanics. Case studies show that this method is correct and reasonable.

关 键 词：水工结构 等效线性化正应力 直接内力法 拱坝建基面 

分 类 号：TV31[水利工程—水工结构工程]