Applicability of damage plasticity constitutive model for ultra-high performance fibre-reinforced concrete under impact loads
Applicability of damage plasticity constitutive model for ultra-high performance fibre-reinforced concrete under impact loads
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DOI：
10.1016/j.ijimpeng.2017.12.013
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发表时间：
2018-04
影响因子：
5.1
通讯作者：
H. Othman;H. Marzouk
中科院分区：
文献类型：
--
作者：
H. Othman;H. Marzouk
本文提出了一个数值研究，以评估是否可以使用混凝土损伤塑性（CDP）本构模型来模拟新的超高性能纤维混凝土（UHP-FRC）材料在不同的损伤阶段的冲击加载速率下。数值模型的性能进行了验证，通过比较数值计算结果与实验数据，作者以前测试。本文还介绍了实验测试，旨在表征应变率对UHP-FRC的影响。使用ABAQUS/Explicit进行了数值模拟。CDP参数是根据对照试样的冲击试验结果确定的。通过对两块不同配筋率的UHP-FRC板在反复落锤冲击荷载作用下的试验研究，发现采用CEB-FIP（1990）模型预测的UHP-FRC材料抗压和抗拉强度增长与应变率效应试验结果吻合较好。数值计算结果表明，CDP本构模型的可行性，在动态加载速率下分析超高压-FRC。计算的响应是敏感的CDP参数有关的张力，断裂能，和塑性体积变化。在对具有低应变硬化性能的超高压纤维增强混凝土材料进行非线性有限元分析时，拉伸应变硬化效应可以忽略。
This paper presents a numerical investigation on assessing whether the concrete damage plasticity (CDP) constitutive model can be used to simulate new ultra-high performance fibre reinforced concrete (UHP-FRC) material under impact loading rates at different damage stages. The performance of the numerical models is verified by comparing numerical results to the experimental data that were previously tested by the authors. This paper also presents experimental tests that aimed to characterize the strain rate effect on UHP-FRC. The numerical simulations have been performed using ABAQUS/Explicit. CDP parameters are identified based on impact test results of a control specimen. Subsequently, the predictive capability of calibrated model has been investigated by simulating two UHP-FRC plates with varied steel reinforcement ratios tested under repeated drop-weight impact loads.It has been found that compressive and tensile strength enhancement predicted using CEB-FIP Model Code (1990) fits well with test results of the strain rate effect on UHP-FRC material. The numerical results demonstrate the feasibility of the CDP constitutive model for analyzing UHP-FRC under dynamic loading rates. Computed responses are sensitive to CDP parameters related to the tension, fracture energy, and plastic volumetric change. The effect of tensile strain hardening response could be ignored in the nonlinear finite element (FE) analysis of UHP-FRC materials with low strain-hardening behaviour.