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首页> 外文期刊>The Journal of the Acoustical Society of America >Three-dimensional modeling and numerical predictions of multimodal nonlinear behavior in damaged concrete blocks
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Three-dimensional modeling and numerical predictions of multimodal nonlinear behavior in damaged concrete blocks

机译：损坏混凝土砌块中多峰非线性行为的三维建模与数值预测

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摘要

In this paper, the multimodal nonlinear elastic behavior of concrete, which is representative of a consolidated granular material, is modeled numerically. Starting from a local three-dimensional softening law, the initial stiffness properties are re-estimated according to the local strain field. The experiments deal with samples of thermally damaged concrete blocks successively excited around their first three modes of vibration. The geometry of these samples cannot be described by a one-dimensional approximation in these experiments where compressional and shear motions are strongly coupled. Despite this added complexity, the nonlinear behavior for the three modes of vibration of the samples is well captured by the simulations using a single scalar nonlinear parameter appropriately integrated into the elasticity equations. It is shown that without sufficient attention paid to the latter, the conclusions would have brought erroneous statements such as nonlinearity dispersion or strain type dependence.
机译：本文在数值上建模的混凝土的多模式非线性弹性行为，其代表综合粒状材料。从局部三维软化法开始，根据局部应变场重新估计初始刚度特性。实验对热损坏的混凝土块样品围绕其前三种振动方式追加激动。这些样品的几何形状不能通过在这些实验中的一维近似来描述，其中压缩和剪切运动强烈耦合。尽管增加了复杂性，但是使用适当集成到弹性方程中的单个标量非线性参数的模拟拍摄了三种振动模式的非线性行为。表明，没有足够的注意力给后者支付了足够的注意，结论将带来错误的陈述，例如非线性分散或应变型依赖性。

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