重力坝应力计算的能量误差控制标准  

Energy Error Control Standard in Gravity Dam Stress Calculation

作　　者：李留强[1] 

机构地区：[1]辽宁电力勘测设计院,辽宁沈阳110005

出　　处：《水电能源科学》2008年第4期129-132,共4页Water Resources and Power

摘　　要：针对目前重力坝有限元计算仍无应力取值标准,应用自适应有限元法对重力坝进行多种工况下的自适应计算,提出了基于h—型自适应有限元法的全域能量误差限控制标准。计算表明,对给定的全域能量误差限,采用ANSYS程序的网格剖分自适应策略可满足误差要求,且不受单元尺寸改变控制因子的影响,不因坝踵部位应力集中而产生不收敛现象;对不同初始网格和无初始网格,相同的全域能量误差限能得到建基面上基本相同的应力结果;重力坝稳定的临界全域能量误差限不随坝高和弹模比的变化而改变。Bacause gravity dam still doesn＇t have the corresponding stress control criterion of FEM,this paper applies adaptive FEM to the study, the global energy error limit control criterion based on h-version adaptive FEM is put forward according to adaptive calculation of gravity dam. The linear elastic adaptive FEM calculation results can draw the following conclusions. For the given global energy error limit, the calculation results can meet the required error to use adaptive mesh strategy of ANSYS program, and the influence of controlling parameters of mesh size can be ignored, and the stress singu-larity of dam heel doesn＇t influence the convergence of adaptive calculation. For the different original gridding and no original gridding ,the stress of dam foundation surface can achieve the approximate results if the same global energy error limit is adopted. There is a stable critical global energy error limit for gravity dam, moreover, the critical global energy error lim-it isn＇t influenced by the height of dam and ratio of elastic modulus.

关 键 词：重力坝 应力 自适应有限元 能量误差限 

分 类 号：TV642.3[水利工程—水利水电工程]