| 冻融循环下BFRP筋与混凝土黏结强度试验研究 |
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| 引用本文： | 吴小勇,周凯,朱永帅,袁晓露.冻融循环下BFRP筋与混凝土黏结强度试验研究[J].建筑结构学报,2021,42(Z1):442-447. |
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| 作者姓名： | 吴小勇 周凯 朱永帅 袁晓露 |
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| 作者单位： | 1. 三峡大学 土木工程学院， 湖北宜昌 443002； 2. 广东省高等学校结构与风洞重点实验室， 广东汕头 515063 |
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| 基金项目： | 国家自然科学基金项目(51608303)，广东省高等学校结构与风洞重点实验室开放基金(201702)，宜昌市应用基础研究项目(A19-302-09)。 |
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| 摘 要： | 为了研究冻融循环作用下BFRP筋与混凝土黏结强度，对不同冻融次数（0、10、20、40次）和不同混凝土强度等级（C30、C35、C40）共36个试件进行冻融循环试验和中心拉拔试验。试验结果表明:未经冻融循环的试件和冻融循环40次（C30）试件发生拔出破坏，其余冻融试件均发生劈裂破坏；随着混凝土强度等级提高，脱胶强度和黏结强度逐渐增加；随着冻融循环次数增加，BFRP筋与混凝土的黏结强度和峰值滑移呈现出先增加后减小的趋势，而脱胶强度随冻融循环次数增加逐渐减小。
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| 关 键 词： | BFRP筋 冻融循环 混凝土强度等级 静力试验 黏结强度 |
Experimental study on bond strength between BFRP bars and
concrete under freeze-thaw cycles |
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| WU Xiaoyong,ZHOU Kai,ZHU Yongshuai,YUAN Xiaolu.Experimental study on bond strength between BFRP bars and
concrete under freeze-thaw cycles[J].Journal of Building Structures,2021,42(Z1):442-447. |
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| Authors: | WU Xiaoyong ZHOU Kai ZHU Yongshuai YUAN Xiaolu |
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| Affiliation: | 1. College of Civil Engineering and Architecture, China Three Gorges University, Yichang 443002, China；;
2. Key Laboratory of Structure & Wind Tunnel of Guangdong Higher Education Institutes, Shantou 515063, China; |
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| Abstract: | To study the bond strength between BFRP bars and concrete under freeze-thaw cycles, freeze-thaw cycles test and central pull-out test were carried out on 36 specimens with different freeze-thaw times (0, 10, 20, and 40 times) and different concrete strength grades (C30, C35, C40). The experiment results show that all the specimens fail due to the splitting failure of the concrete except for the specimens without freeze-thaw cycles and specimens adopting C30 concrete with 40 freeze-thaw cycles, which exhibit pulling-out failure. With the increase of strength grade of concrete, the debonding strength gradually increases, but the ultimate bond strength does show a proportional increase. With the increase of freeze-thaw cycles, the ultimate bond strength and peak slip between BFRP bars and concrete show an increasing trend followed with decreasing, while the debonding strength gradually decreases. |
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| Keywords: | BFRP bars freeze-thaw cycles concrete strength grade static test bond strength |
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