High-fidelity prediction of crack formation in 2D and 3D pullout tests
High-fidelity prediction of crack formation in 2D and 3D pullout tests
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DOI：
10.1016/j.compstruc.2016.05.001
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发表时间：
2016-08-01
影响因子：
4.7
通讯作者：
Chiumenti, Michele
中科院分区：
文献类型：
--
作者：
Benedetti, Lorenzo;Cervera, Miguel;Chiumenti, Michele
本文采用标准有限元和混合有限元对混凝土块中钢锚具的拉拔试验进行了二维和三维数值分析。一种新的（稳定的）混合配方中的变量的总应变8和位移u的引入，以克服固有的缺陷的标准位移为基础的一个在本地化的背景下的应变，如网格依赖性。混凝土的准脆性行为采用局部朗肯屈服准则的弹塑性本构关系来描述。所提出的配方被证明是一个可靠和准确的工具，敏感的物理参数的拉拔试验，但相对于所采用的有限元网格的客观。此外，混合的N-S/U有限元能够捕捉正确的破坏机制与相对粗糙的离散化。同时，标准公式的伪行为并没有通过网格细化得到缓解。(C)2016爱思唯尔有限公司版权所有
This paper presents the 2D and 3D numerical analysis of pullout tests on steel anchorages in concrete blocks using standard and mixed finite elements. A novel (stabilized) mixed formulation in the variables of total strain 8 and displacements u is introduced to overcome the intrinsic deficiencies of the standard displacement-based one in the context of localization of strains, such as mesh dependency. The quasi brittle behavior of concrete is described through an elastoplastic constitutive law with a local Rankine yielding criterion. The proposed formulation is shown to be a reliable and accurate tool, sensitive to the physical parameters of the pullout tests, but objective with respect to the adopted FE mesh. Furthermore, the mixed epsilon/u finite element is able to capture the correct failure mechanism with relatively coarse discretizations. At the same time, the spurious behavior of the standard formulation is not alleviated by mesh-refinement. (C) 2016 Elsevier Ltd. All rights reserved.