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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

42卷

期数:

2025年06期

页码:

77-86

栏目:

建筑结构

出版日期:

2025-11-25

文章信息/Info

Title:

Study on bond-slip behavior of steel tube alkali-activated concrete composite columns

文章编号:

1673-2049(2025)06-0077-10

作者:

任志刚,许天恩,李旗,冯逸轩

(武汉理工大学 土木工程与建筑学院,湖北 武汉 430070)

Author(s):

REN Zhigang, XU Tianen, LI Qi, FENG Yixuan

(School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, Hubei, China)

关键词:

碱激发混凝土;  叠合柱;  荷载-滑移曲线;  推出试验;  黏结性能

Keywords:

alkali-activated concrete;  composite column;  load-slip curve;  push-out test;  bond performance

分类号:

TU398.9

DOI:

10.19815/j.jace.2024.02022

文献标志码:

A

摘要:

为研究钢管碱激发混凝土叠合柱界面黏结性能,对10个钢管碱激发混凝土叠合柱试件进行推出试验,分析钢纤维体积率、含管率、体积配箍率对钢管碱激发混凝土叠合柱界面黏结性能的影响。试验加载过程中,仔细观察试件的裂缝发展和破坏形态,并得到了试件的荷载-滑移曲线,通过对荷载-滑移曲线分析和归类,总结出具有典型形式的荷载-滑移曲线。深入分析了各变化参数对特征黏结强度的影响规律,运用灰色关联理论建立了特征黏结强度计算式。结果表明:推出试验后的试件整体较为完整,外部混凝土表面无明显裂缝,加载端面混凝土有一定损伤,荷载-滑移典型曲线分为3类; 特征黏结强度随钢纤维体积率和体积配箍率的增加而增加; 残余黏结强度随含管率的增加而减小,存在最佳截面尺寸范围,使极限黏结强度达到最大值; 灰色关联理论能够较好地反映特征黏结强度与各影响因素之间的关系,其中钢纤维体积率与极限黏结强度相关性最强,含管率与残余黏结强度相关性最强。

Abstract:

In order to study the interfacial bond performance of steel tube alkali-activated concrete composite columns, 10 specimens of steel tube alkali-activated concrete composite columns were subjected to pull-out tests to analyze the effects of steel fiber volume ratio, steel tube area ratio, and volume stirrup reinforcement ratio on the interfacial bond performance of steel tube alkali-activated concrete composite columns. During the experimental loading process, the crack development and failure mode of the specimen were carefully observed, and the load-slip curve of the specimen was obtained. By analyzing and classifying the load-slip curve, the typical forms of load-slip curves was summarized. The impact law of various changing parameters on the characteristic bond strength were analyzed in-depth, and a formula for calculating the characteristic bond strength using grey correlation theory was established. The results show that the overall integrity of the test specimen after pull-out test is relatively complete, with no obvious cracks on the external concrete surface, and some damage to the loading ends section concrete. The typical load-slip curve is divided into three categories. The characteristic bond strength increases with the increase of steel fiber volume ratio and volume stirrup reinforcement ratio. The residual bond strength decreases with the increase of steel tube area ratio, and there exists an optimal range of cross-sectional dimensions to achieve the maximum ultimate bond strength. Grey correlation theory can better reflect the relationship between characteristic bond strength and various influencing factors, among which the correlation between steel fiber volume ratio and ultimate bond strength is the strongest, and the correlation between steel tube area ratio and residual bond strength is the strongest.

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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2024-02-11
基金项目:武汉理工大学三亚科教创新园开放基金项目(2022KF001)
作者简介:任志刚(1974-),男,工学博士,教授,博士生导师,E-mail:whut.ren@163.com。

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更新日期/Last Update: 2025-11-25