基于ABAQUS的重力坝时程动力分析

The ABAQUS-based Dynamic Analysis of Gravity Dam Time-histories

基于有限元软件ABAQUS,采用时程分析法,研究了重力坝在地震作用下非线性动力响应、坝体的损伤破坏过程及破坏形态。以工程实例在关键点的动位移、动应力和点安全系数得出了坝体在地震作用下的工作性态。并得出结论:损伤是除应力、位移及点安全系数法之外对结构安全评价的可信指标之一,坝体上、下游折坡点及坝踵部位是混凝土重力坝的抗震薄弱部位,这为研究大坝的抗震对策和抗震设计提供参考依据,并推广了ABAQUS在水利工程中的应用。

Based on the finite element software ABAQUS the paper makes a study of non - linear dynamic response of a gravity dam under seismic action, and of process and feature of damage of its body using the time - histories analysis method. Taking the project as an example the paper has obtained the working condition of the dam body under seismic action according to the dynamic displacement, dynamic stress and point safety coefficient at the critical points. The paper has concluded that the damage is one of the credible factors to assess the structure safety in addition to stress, displacement and point safety coefficient and that both upstream and downstream points of gradient change of the dam and the dam heel are all considered as weak positions to resist an earthquake, which gives reference to study of earthquake - resistant measures and earthquake - resistant design of dams. The ABAQUS software has widely been applied to hydraulic projects.