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坑蚀箍筋约束混凝土单轴应力-应变模型的修正

Modification of Uniaxial Stress-Strain Model of Concrete Confined by Pitting Corroded Stirrups.

作者信息

Miao Zhiwei, Liu Yifan, Chen Kangnuo, Niu Xinping

机构信息

School of Civil Engineering, Southeast University, Nanjing 211189, China.

出版信息

Materials (Basel). 2024 Dec 9;17(23):6014. doi: 10.3390/ma17236014.

DOI:10.3390/ma17236014
PMID:39685449
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11643964/
Abstract

To investigate the impact of stirrup pitting corrosion on the stress-strain model of core concrete under compression, this study, based on existing corroded steel specimens, establishes a probabilistic model of the residual cross-sectional area distribution of steel bars to reasonably evaluate the effect of pitting on the mechanical performance of stirrups. Considering the tension stiffening effect in reinforced concrete, a time-dependent damage model of corroded steel bars in concrete was determined, and the existing stress-strain model of concrete confined by stirrups was ultimately modified, establishing a time-dependent constitutive model that incorporates the effects of stirrup pitting corrosion. A comparison with previous experimental results indicates that the revised model presented in this paper can appropriately reflect the changes in the mechanical performance of concrete confined by corroded stirrups. The results of this study can provide theoretical support for the refined numerical analysis of reinforced concrete structures under the erosion of chloride ions.

摘要

为研究箍筋点蚀对核心混凝土受压应力-应变模型的影响，本研究基于现有的锈蚀钢筋试件，建立了钢筋残余截面积分布的概率模型，以合理评估点蚀对箍筋力学性能的影响。考虑到钢筋混凝土中的拉伸强化效应，确定了混凝土中锈蚀钢筋的时变损伤模型，并最终对现有的箍筋约束混凝土应力-应变模型进行修正，建立了考虑箍筋点蚀影响的时变本构模型。与以往试验结果对比表明，本文提出的修正模型能够合理反映锈蚀箍筋约束混凝土力学性能的变化。研究结果可为氯离子侵蚀环境下钢筋混凝土结构的精细化数值分析提供理论支持。

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本文引用的文献

1
Degradation of Steel Rebar Tensile Properties Affected by Longitudinal Non-Uniform Corrosion.纵向不均匀腐蚀对钢筋拉伸性能的降解影响
Materials (Basel). 2023 Apr 6;16(7):2917. doi: 10.3390/ma16072917.
2
A Prediction Model of the Concrete Cracking Induced by the Non-Uniform Corrosion of the Steel Reinforcement.钢筋非均匀锈蚀引起混凝土开裂的预测模型
Materials (Basel). 2020 Feb 12;13(4):830. doi: 10.3390/ma13040830.
3
The Constitutive Relationship for Corroded Steel Bars: Model and Analysis.锈蚀钢筋的本构关系：模型与分析。
Materials (Basel). 2019 Dec 5;12(24):4058. doi: 10.3390/ma12244058.
4
Experimental Study on Shear Capacity of Reinforced Concrete Beams with Corroded Longitudinal Reinforcement.锈蚀纵筋钢筋混凝土梁抗剪承载力试验研究
Materials (Basel). 2019 Mar 12;12(5):837. doi: 10.3390/ma12050837.