PVC-CFRP管钢筋混凝土柱的偏心受压性能

发布时间：2018-01-29 17:41

本文关键词： PVC-CFRP管承载力延性混凝土柱荷载-挠度关系　出处：《复合材料学报》2017年10期 　论文类型：期刊论文

【摘要】：通过24根聚氯乙烯-碳纤维增强树脂(PVC-CFRP)管钢筋混凝土柱的偏心受压试验,分析了CFRP条带环箍间距和偏心距对PVC-CFRP管钢筋混凝土柱的破坏形态、承载力、应变及荷载-位移关系的影响。试验结果表明:小偏压试件发生混凝土和PVC管的压碎破坏,大偏压试件发生钢筋受拉屈服和PVC管的拉断破坏。随着偏心距和CFRP条带环箍间距的增加,与PVC管钢筋混凝土柱相比,PVC-CFRP管钢筋混凝土试件的承载力逐渐减小,小偏压试件延性系数有不同程度的提高,大偏压试件延性系数基本保持不变。纵向钢筋和混凝土应变发展基本一致,截面受压侧CFRP条带的应变较小,试件截面的应变基本符合平截面假定。试件的荷载-挠度关系和弯矩-曲率关系分为两阶段,CFRP条带环箍间距和偏心距对第一阶段基本没有影响,第二阶段为直线强化段,随着偏心距和CFRP条带环箍间距的增加,强化段的斜率逐渐减小。
[Abstract]:The eccentricity compression tests of 24 reinforced concrete (PVC)-carbon fiber reinforced resin (PVC-CFRP) pipe columns were carried out. The failure mode and bearing capacity of CFRP reinforced concrete columns with ring band spacing and eccentricity are analyzed. The experimental results show that the concrete and PVC tube are crushed by small eccentric compression. The tensile yield of steel bar and the tensile failure of PVC pipe occur in large eccentric compression specimens. With the increase of eccentricity and the spacing of CFRP band hoop, it is compared with the reinforced concrete column of PVC pipe. The bearing capacity of reinforced concrete specimens of PVC-CFRP pipe decreases gradually, and the ductility coefficient of small eccentric compression specimens is improved to some extent. The ductility coefficient of large eccentric compression specimens remains basically unchanged. The strain development of longitudinal steel bar and concrete is basically the same, and the strain of CFRP strip on the compression side of section is smaller. The strain of the specimen basically accords with the assumption of the plane section. The load-deflection relationship and the moment-curvature relationship of the specimen are divided into two stages: the spacing of the band hoop and the eccentricity of the CFRP strip have no effect on the first stage. In the second stage, the slope of the strengthening segment decreases with the increase of eccentricity and CFRP band hoop spacing.
【作者单位】：西安建筑科技大学土木工程学院;安徽工业大学建筑工程学院;
【基金】：国家自然科学基金(51590914;51578001;51008001;51608003) 安徽省重点研究与开发计划(1704a0802131) 安徽省高校优秀青年人才支持计划重点项目(gxyqZD2016072) 安徽省教育厅重大科学研究(KJ2015ZD10)
【分类号】：TU375.3
【正文快照】： 网络出版地址:www.cnki.net/kcms/detail/11.1801.TB.20170222.1642.004.html引用格式:牛荻涛,于峰,王忠文.PVC-CFRP管钢筋混凝土柱的偏心受压性能[J].复合材料学报,2017,34(10):2356-2366.NIU D T,YU F,WANG Z W.Eccentric compression performance of PVC-CFRP confined rei

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