Confinement mechanism and constitutive model of SRC columns with cross-shaped steel sections

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Magazine of Concrete Research Pub Date : 2023-12-08 DOI:10.1680/jmacr.23.00186

Hong Xiang, Fuyu Mao, Chen Wu, Shenglan Ma

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Abstract

This paper proposes a novel confined concrete constitutive model for steel reinforced concrete (SRC) columns with cross-shaped steel (CSS) sections based on the similar characteristics of descending branches in stress-strain curves of confined and unconfined concrete, by considering confinement degradation caused by the buckling of steel section or longitudinal reinforcement. The confined region of SRC columns with CSS sections was divided into four parts: highly steel-confined concrete (HSC), partially steel-confined concrete (PSC), stirrup confined concrete (SCC), and unconfined concrete (UCC). Additionally, relevant effective confinement coefficient expressions were presented. Simulation results of existing tests showed that (1) load-strain curves obtained by using the modified stress-strain constitutive model agreed well with the experimental results, with the error in the descending branch smaller than 5%; (2) the HSC region for SRC columns with CSS sections in the finite element model (FEM) was in a good agreement with that in the proposed region division; (3) concrete confined region boundaries simulation for SRC columns with CSS sections were determined by using plumb lines for improving the calculation efficiency.

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带十字形钢截面的 SRC 柱的约束机制和构造模型

本文考虑钢筋截面屈曲或纵筋屈曲引起的约束退化，基于约束混凝土与无约束混凝土应力-应变曲线下降分支的相似特征，提出了一种新的钢筋混凝土柱约束混凝土本构模型。将带CSS截面的SRC柱的约束区域分为高度钢约束混凝土(HSC)、部分钢约束混凝土(PSC)、箍筋约束混凝土(SCC)和无约束混凝土(UCC)四个部分。并给出了相应的有效约束系数表达式。现有试验的仿真结果表明:(1)修正应力-应变本构模型得到的荷载-应变曲线与试验结果吻合较好，下降分支误差小于5%;(2)有限元模型中带CSS截面的SRC柱的HSC区域与建议的区域划分吻合较好;(3)为提高计算效率，采用铅垂线法确定了带有CSS截面的SRC柱的混凝土约束区域边界模拟。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.