基于MSC.Marc的高混凝土坝非线性时效变形量化的程序实现

Program implementation of quantifying the nonlinear time-dependent deformation of high concrete dams based on MSC.Marc

变形是混凝土坝结构性态的综合反映,尤其是时效变形,是评价大坝结构性态转异和长效服役健康状况的重要指标.针对坝体混凝土徐变和坝基岩体蠕变等材料固有时效变形特征所引起的混凝土坝时效变形,组建了适合高混凝土坝变形的坝体、坝基非线性时变本构模型,并研究了三维应力状态下的时效变形方程,提出了基于Drucker-Prager屈服函数的坝基岩体蠕变分段准则;在此基础上,基于通用商业有限元软件MSC.Marc,研究了本文所建非线性时变本构模型的二次开发程序实现方法,进而实现对高混凝土坝固有时效变形的量化分析.通过算例验证了基于MSC.Marc进行二次开发的可行性和正确性,某高混凝土重力坝固有时效变形的正反分析结果表明了所建模型的工程实用性.

Deformation is a comprehensive performance of concrete dam structures,especially the time-dependent deformation,a key index for evaluation of the structure behaviors,health status,and their evolution of a dam in long-term service.Aiming at the inherent timedependent deformation behaviours of dam concrete and foundation rock,nonlinear time-dependent constitutive model is suitably established for the deformation of high concrete dams in this paper.Then,the time-dependent deformation equations for dam concrete and foundation rock in three-dimensional stress state are studied,and the corresponding segmentation criteria based on the DruckerPrager yield function is proposed.On this basis,on the platform of the general commercial finite element software MSC.Marc,implementation method of the second development program of the established nonlinear time-dependent constitutive model is proposed.The correctness of the established model and its second development method based on MSC.Marc are verified by an example.The analysis and back analysis results of the inherent time-dependent deformation of a high concrete gravity dam show the engineering practicability of the established model.