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不锈钢带箍增强玻璃纤维编织缠绕管约束混凝土短柱轴压性能研究
作者：应宗豪1，高剑平1，2，涂序纪1
（1.华东交通大学 土木建筑学院，江西 南昌 330013；
2.华东交通大学 土木工程国家级试验教学示范中心，江西 南昌 330013）
摘要：设计制作不锈钢带箍增强玻璃纤维编织缠绕管（PSSH-BWFRP）约束混凝土柱，分析了不锈钢带箍间距和预应力水平对PSSH-BWFRP约束混凝土柱的承载力、峰值位移和延性的影响规律。结果表明：PSSH-BWFRP约束混凝土短柱试件都是因不锈钢带箍之间的玻璃纤维局部断裂，随后碎裂压溃的混凝土从断裂处涌出而破坏；不锈钢带箍间距对承载力和延性影响较大，承载力和延性随着不锈钢带箍间距减小而增大，而预应力水平对承载力和延性影响很小；不锈钢带箍间距和预应力水平对峰值位移影响均很小；过高的预应力水平对承载力、峰值位移和延性反而不利，建议预应力水平控制在0.35为宜。
关键词：不锈钢带箍；玻璃纤维编织缠绕管；约束混凝土；不锈钢带箍间距；不锈钢带箍预应力水平
中图分类号：TU528.7 文献标识码：A 文章编号：1001-702X（2022）11-0060-05
Study on axial compression behavior of concrete-filled BWFRP tube stubs retrofitted with stainless steel strip hoop
YING Zonghao1，GAO Jianping1，2，TU Xuji1
（1.School of Civil Engineering and Architecture，East China Jiaotong University，Nanchang 330013，China；2.National Experimental Teaching Demonstration Center of Civil Engineering，East China Jiaotong University，Nanchang 330013，China）
Abstract：A new type of composite column is proposed，which is herein referred to as concrete filled BWFRP tube retrofitted with stainless steel strip hoop（PSSH-BWFRP）. The influence of the spacing and degree of stainless steel strip hoop on the bearing capacity，peak displacement and ductility of concrete-filled PSSH-BWFRP stubs was analyzed. The results show that the failure process of concrete-filled PSSH-BWFRP stubs was similar，which was firstly caused by the local fracture of glass fiber，followed by crushed concrete gushing forth from the opening，where glass fiber between stainless steel strip hoop fractured suddenly. The bearing capacity and ductility are affected greatly by the spacing of stainless steel strip hoop，which increase with the decrease in the spacing of stainless steel strip hoop，while they are affected little by the prestress degree of stainless steel strip hoop. The peak displacement is affected little by the spacing and degree of prestress of stainless steel strip hoop. The bearing capacity，peak displacement and ductility are affected adversely when the prestress degree of stainless steel strip hoop is too much，which could be controlled within 0.35.
Key words：stainless steel strip hoop，braiding-winding fiber reinforced plastics tube，confined concrete，spacing of stainless steel strip hoop，degree of prestress of stainless steel strip hoop