Numerical simulation of collapse scenarios in reduced scale tests of arch dams
Numerical simulation of collapse scenarios in reduced scale tests of arch dams
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DOI：
10.1016/j.engstruct.2006.01.012
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发表时间：
2006-08
影响因子：
5.5
通讯作者：
S. Oliveira;R. Faria
中科院分区：
文献类型：
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作者：
S. Oliveira;R. Faria
本文致力于混凝土坝的破坏场景的数值模拟，实验再现缩小比例的模型。就混凝土材料而言，一个连续损伤力学模型，其中包括两个独立的标量损伤变量，一个拉伸和压缩，采用和简要说明。无论是在拉伸和压缩材料软化再现，和固有的本地化现象是通过一个一致的特征长度规则化。最近建成的大型混凝土坝模型的两个应用程序：一个关于混凝土强度逐渐降低，直到失败的情况下，和其他有关的情况下，相对位移规定的基础故障。因此，在相当不同的条件下检查数值模型的性能，即，当由于顶拱破碎或受跨越大坝的主要裂缝影响而导致坍塌时。
This paper is dedicated to the numerical simulation of failure scenarios of concrete dams, reproduced experimentally on reduced scale models. As far as the concrete material is concerned, a Continuum Damage Mechanics model that incorporates two independent scalar damage variables, one for tension and the other for compression, is adopted and briefly described. Both in tension and compression material softening is reproduced, and the inherent localization phenomenon is regularized through a consistent characteristic length. Two applications involving mock-ups of large concrete dams recently built are presented: one with respect to a scenario where concrete strength is gradually reduced until failure, and the other concerning a scenario where a relative displacement is prescribed on a foundation fault. Performance of the numerical model is therefore checked on rather dissimilar conditions, that is, when collapse is reached due to crushing of the crest arch, or influenced by a dominant crack crossing the dam.