Investigation on post-fire bond behavior between section steel and concrete in SRCFST columns

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2024-09-27 DOI:10.1016/j.istruc.2024.107384

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Abstract

This paper presents an experimental and numerical investigation on post-fire bond behavior between section steel and concrete in steel-reinforced concrete-filled steel tubular (SRCFST) columns. The pushout tests on 22 post-fire SRCFST specimens were conducted, and test parameters included the fire exposure time, cross-sectional dimension of section steel, section steel-concrete interface length, and the loading ways. The effect of different parameters on the load-slip curves were analyzed. The results shown that the fire exposure time has an obvious influence on the bond strength of the interface. As the fire exposure time increases from 30 min to 60 min and 90 min, the average ultimate bond strength of post-fire specimens decreases by 48.3 % and 69.5 %, respectively. Based on the experimental results, the simplified full-range bond strength-slip model of the section steel-concrete interface in post-fire SRCFST columns was proposed. The finite element analysis model on the bond behavior of the section steel-concrete interface of post-fire SRCFST columns was finally developed and calibrated, and was used to analyze the stress distribution and variation of the section steel-concrete interface.

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关于 SRCFST 柱中型钢与混凝土之间火灾后粘结行为的研究

本文对钢筋混凝土填充钢管（SRCFST）柱中型钢与混凝土的火后粘结行为进行了实验和数值研究。试验参数包括火灾暴露时间、型钢截面尺寸、型钢-混凝土界面长度和加载方式。分析了不同参数对荷载-滑移曲线的影响。结果表明，火灾暴露时间对界面粘结强度有明显影响。随着火灾暴露时间从 30 分钟增加到 60 分钟和 90 分钟，火灾后试样的平均极限粘结强度分别降低了 48.3% 和 69.5%。根据实验结果，提出了火灾后 SRCFST 柱截面钢-混凝土界面的简化全范围粘结强度-滑移模型。最终建立并校核了火灾后 SRCFST 柱截面钢-混凝土界面粘结行为的有限元分析模型，并用于分析截面钢-混凝土界面的应力分布和变化。

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

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.