氯盐侵蚀作用后钢-FRP复合筋混凝土柱偏心受压性能试验研究
Experimental study on eccentric compression behavior of steel-FRP composite bars RC columns subjected to chloride corrosion
帅华国 1朱世鑫 2葛文杰 2倪增昊 2ASHRAF Ashour3
作者信息
- 1. 扬州大学工程设计研究院有限公司,扬州 225009
- 2. 扬州大学建筑科学与工程学院,扬州 225127
- 3. 布拉德福德大学工程与信息学院,布拉德福德 BD71DP
- 折叠
摘要
为研究氯盐侵蚀作用后钢-FRP复合筋(SFCB)混凝土柱偏心受压性能,对经氯盐侵蚀后的SFCB及SFCB混凝土偏心受压柱进行力学性能试验.研究了配筋类型、配筋率、偏心距、长细比、应力水平与侵蚀时间对承载力、侧向变形、裂缝和破坏形态的影响.结果表明:筋材强度保留率随侵蚀时间增加而降低,无应力侵蚀 180d后,钢筋、SFCB和FRP筋极限强度分别降低了 12.2%、9.9%和 3.6%;随筋材截面含钢率的增加,SFCB混凝土偏心受压柱承载力逐渐提高,侧向变形逐渐减小;侵蚀后钢筋组、SFCB组和FRP筋组试件极限承载力分别较其未侵蚀试件最大下降 16.6%、12.4%和 7.2%.SFCB混凝土柱具有良好的抵抗侧向变形和裂缝的能力.
Abstract
In order to investigate the eccentric compression behaviors of steel-FRP composite bar(SFCB)reinforced concrete(RC)columns subjected to chloride corrosion,the mechanical experiments of chloride corroded SFCB and SFCB RC eccentric compression columns were conducted.The effect of reinforcement type,reinforcement ratio,eccentricity,slenderness,stress level and corrosion duration on bearing capacity,deformation,crack and failure pattern were investigated.The results show that the strength retention ratio of reinforcement decreases with the increase of corrosion duration,the ultimate strengths of steel bar,SFCB and FRP bar decreased 12.2%,9.9%and 3.6%respectively.With the increase of steel content of reinforcement,the bearing capacity of SFCB RC eccentric compression column increases while the deformation decreases gradually.The ultimate bearing capacity of corroded steel bar,SFCB and FRP specimens maximally decreases 16.6%,12.4%and 7.2%respectively,when compared with those of uncorroded specimens.SFCB RC columns exhibit good deflection and crack resistance.
关键词
混凝土柱/钢-FRP复合筋/偏心受压/氯盐侵蚀/承载力Key words
concrete column/steel-FRP composite bar/eccentric compression/chloride corrosion/bearing capacity引用本文复制引用
出版年
2024
NETL
NSTL
万方数据