Modified discrete numerical model for reinforced concrete structures

被引：0
|
作者：
Zeng F. [1 ,2 ]
Feng X. [3 ]
Huang C. [1 ,2 ]
Xu Q. [1 ,2 ]
Xiao G. [1 ,2 ,4 ]
Tian R. [1 ,2 ]
机构：
[1] CAEP Software Center for High Performance Numerical Simulation, Beijing
[2] Institute of Applied Physics and Computational Mathematics, Beijing
[3] Institute of Systems Engineering, China Academy of Engineering Physics, Sichuan, Mianyang
[4] School of Science, Nanjing University of Science and Technology, Jiangsu, Nanjing
来源：
Baozha Yu Chongji/Explosion and Shock Waves | 2022年 / 42卷 / 06期
关键词：
bond-slip; concrete; explosion load; reinforcement bar;
D O I：
10.11883/bzycj-2021-0286
中图分类号：
学科分类号：
摘要：
The interaction between rebar and concrete must always be considered to well describe and predict the mechanical behavior of reinforced concrete (RC) structures. A common way to model RC structures is by discrete reinforcements in finite element models where the discrete reinforcements imply that bond conditions between rebar and concrete are perfect. In order to take into account the bond-slip phenomenon, a modified discrete numerical model for RC structures is presented in this paper. The model is formulated within the framework of the mixture theory, considering two phases corresponding to the matrix concrete and the reinforcement bars and incorporating bond-slip effects to the stress-strain relation of the latter by considering the bond-slip model recommended by CEB-FIB. A nonlinear equivalent stress-strain relation for discrete steel bars is generated by incorporating the bond-slip strain to the strain of bars. Based on this model, a comprehensive parametric study is accomplished to obtain the influence of the parameters, including the strengths of the concrete and steel bars as well as the diameter of bars on the modified stress-strain relation of the discrete steel bars. In comparison to the traditional discrete numerical model where interface elements are generated via connecting the degrees of freedom of the bars and concrete meshing, the new model allows for the slipping of the steel bars without explicit discretization of the steel bars and the steel/concrete interfaces. This fact makes it attractive for numerical simulation of concrete structures at the macrostructural level. Using a code JUST-PANDA that is developed in-house, the model is verified by the explosion experiments at the component level and the structural level respectively. The comparisons with experimental results show that the new model can provide a more reliable prediction of the concrete structural behavior due to the consideration of the bond-slip effects in the stress-strain relation of the discrete steel bars by means of a simple procedure. © 2022 Explosion and Shock Waves. All rights reserved.
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