论文部分内容阅读
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。
Through the eccentric compression test of 24 PVC-CFRP pipe reinforced concrete columns, the failure modes and bearing capacity of the reinforced concrete columns with PVC-CFRP pipe were analyzed. , Strain and load-displacement relationship. The test results show that the crushing failure of concrete and PVC pipe occurs in the small bias test specimen, and the yield stress of the steel bars in the large bias test specimen and the tensile fracture of the PVC pipe damage. Compared with reinforced concrete columns of PVC pipe, the bearing capacity of PVC-CFRP pipe reinforced concrete specimens gradually decreases with the increase of eccentricity distance and the spacing of CFRP band hoops. The ductility coefficient of small-deflection specimens increases to some extent The ductility coefficient of the large-biased specimen remained unchanged. The longitudinal reinforcement and concrete strain development are basically the same. The strain of the CFRP strip on the compression side of the section is small, and the strain of the section of the specimen basically conforms to the assumption of the flat section. The load-deflection relationship and moment-curvature relationship of the specimen are divided into two stages. The spacing and eccentricity of the CFRP band hoop have no effect on the first stage, the second stage is the straight line strengthening section. With the eccentricity and CFRP bar With the hoop spacing increases, the slope of the reinforced section gradually decreases.