|Table of Contents|

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

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

Issue:
2025年06期
Page:
77-86
Research Field:
建筑结构
Publishing date:

Info

Title:
Study on bond-slip behavior of steel tube alkali-activated concrete composite columns
Author(s):
REN Zhigang;  XU Tianen;  LI Qi;  FENG Yixuan
(School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, Hubei, China)
Keywords:
alkali-activated concrete;  composite column;  load-slip curve;  push-out test;  bond performance
PACS:
TU398.9
DOI:
10.19815/j.jace.2024.02022
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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Last Update: 2025-11-25