混凝土面板坝面板动力损伤有限元分析

联合采用混凝土塑性损伤模型和堆石料弹塑性本构模型,建立了面板堆石坝弹塑性动力分析方法,研究了地震荷载作用下混凝土面板的损伤发生和发展过程。计算结果表明：地震时,在0.65H（H为坝高）附近顺坡向拉应力最大,面板首先在该部位出现损伤,同时由于鞭稍效应,0.85H面板附近也出现损伤;采用损伤模型,损伤部位的面板出现软化,应力得到释放,计算结果比线弹性模型更加合理;采用塑性损伤模型可以反映混凝土面板渐进破坏过程,通过损伤变量可以清晰地了解面板的损伤分布和薄弱环节。此研究成果可以为进一步开展混凝土面板堆石坝极限抗震能力及抗震措施分析提供有效手段。

Finite element dynamic analysis for seismic damage of slabs of concrete faced rockfill dams

A 3D elastic-plastic dynamic analysis procedure platform for concrete faced rockfill dams (CFRD) is developed by combining the elastic-plastic model for rock-fill materials with the plastic damage model for concrete. The damage occurrence and development process of concrete slabs under earthquake load are investigated using the procedure. The results show that the maximum slope-direction tensile stress of the slabs occurs at the height of 0.65 of the dam and results in the tensile damage of the slabs at this position during earthquakes. Also, the tensile damage of the slabs occurs at the height of 0.85 of the dam because of the “whiplash effect”. The plastic damage model for concrete can reflect the damage process of the slab precisely. The damage variable can be used to analyze of the damage distribution and weakness position of the slabs. The research results may provide an effective method for the studies on the limit aseismic capacity and the aseismic design of CFRDs.