Numerical investigation of concrete subjected to high rates of uniaxial tensile loading
Numerical investigation of concrete subjected to high rates of uniaxial tensile loading
复制标题
DOI：
10.1016/j.ijimpeng.2007.03.006
复制
发表时间：
2008-05-01
影响因子：
5.1
通讯作者：
Pavlovic, M. N.
中科院分区：
文献类型：
--
作者：
Cotsovos, D. M.;Pavlovic, M. N.
本文研究的是结构混凝土棱柱体在高速单轴拉伸荷载作用下的响应。进行的数值研究是基于能够进行三维（3D）非线性静态和动态分析的有限元（FE）程序。这个程序是已知的，以产生现实的预测的反应范围广泛的平原和混凝土结构形式受到任意的静态和地震作用。此外，它的应用最近已成功地扩展在预测的反应素混凝土棱柱元件在高速率的单轴压缩载荷。有限元程序的主要特点是，它采用了三维材料模型，其特点是既简单又关注结构中混凝土的实际物理行为。它的分析公式是基于这样的假设，即混凝土的材料特性是独立的施加的加载速率（应变率），从而归因于施加的加载速率的影响上的棱镜的响应惯性。这一假设的验证是基于数值和实验数据之间的比较研究，结果显示出良好的一致性。这构成了一个重大的偏离目前的想法，关于材料建模的混凝土在高速率加载。此外，现有的数据（数值和实验）表明，混凝土棱柱体元件的响应取决于与所研究的结构形式的几何形状和材料特性以及所采用的测试方法相关的许多参数。这种依赖性解释，在很大程度上，分散的特点，可用的实验数据，它也表明，实验和数值结果描述的结构，而不是材料的行为，从而提出了关于使用这些数据的有效性的问题，在本构模型的混凝土材料的行为在高速率加载条件下。(c)2007爱思唯尔有限公司保留所有权利。
The present article is concerned with the response of structural concrete prisms to high rates of uniaxial tensile loading. The numerical investigation carried out is based on a finite-element (FE) program capable of carrying out three-dimensional (3D) nonlinear static and dynamic analyses. This program is known to yield realistic predictions to the response of a wide range of plain- and reinforced-concrete structural forms subjected to arbitrary static and earthquake actions. Furthermore, its application has recently been successfully extended in predicting the response of plain-concrete prism elements under high rates of uniaxial compressive loading. The main feature of the FE program is that it incorporates a 3D material model which is characterized by both its simplicity and its attention to the actual physical behaviour of concrete in a structure. Its analytical formulation is based on the assumption that the material properties of concrete are independent of the applied loading rate (strain rate) thus attributing the effect of the applied loading rate on the prism's response to inertia. The validation of this assumption is based on a comparative study between numerical and experimental data which reveals good agreement. This constitutes a major departure from current thinking as regards material modelling of concrete under high-rate loading. In addition, the available data (numerical and experimental) show that the response of the concrete prism elements depends on a number of parameters linked to geometry and material properties of the structural forms under investigation as well as the testing method adopted. This dependence explains, to a significant extent, the scatter that characterizes the available experimental data, and it also suggests that both experimental and numerical results describe structural rather than material behaviour thus raising questions regarding the validity of the use of such data in the constitutive modelling of concrete-material behaviour under high-rate loading conditions. (c) 2007 Elsevier Ltd. All rights reserved.