基于有限元等效应力法的重力坝安全性分析  

Security Analysis of Gravity Dam Based on Finite Element Equivalent Stress Method

作　　者：赵飞 范书立[2] 

机构地区：[1]民政部国家减灾中心,北京100124 [2]大连理工大学海岸与近海工程国家重点实验室,辽宁大连116023

出　　处：《水电能源科学》2013年第6期110-112,109,共4页Water Resources and Power

基　　金：国家自然科学基金资助项目(50909015)

摘　　要：为消除重力坝角缘部位有限元应力失真的影响,采用数值方法对重力坝建基面的有限元应力进行积分,求得建基面上的轴力和弯矩,利用偏心受压公式计算出截面上的有限元等效应力分布。结果表明,有限元等效应力法可消除角缘部位的有限元应力失真现象,且不受网格尺寸的影响,计算结果和材料力学法具有相同的计算精度,得出的坝踵、坝趾应力结果可按《混凝土重力坝设计规范》规定的应力标准评价重力坝坝体安全度。In order to eliminate the effect of singular stresses at dam heel and toe and promote the application of finite element method（FEM） in the concrete gravity dam design,axial force and blending moment are solved by means of numerical integration of the finite element stress along the dam base surface and the FEM equivalent stress distribution of the section is calculated by the eccentric compression formula.Case study shows that this method can avoid the stress concentration on gravity dam heel and dam toe;the equivalent stresses are not influenced with the mesh size;the result has the same precision with material mechanics method;the dam heel equivalent stress can be used for safety assessment of gravity dam according to the national gravity dam design code.

关 键 词：重力坝 有限元 等效应力 设计准则 

分 类 号：TV642[水利工程—水利水电工程] TU973[建筑科学—结构工程]