【摘要】 目的了解圆截面CFRP-钢管混凝土轴压构件的静力性能,分析长径比和弯曲增强系数对该类构件极限承载力和承载力提高率的影响.方法对12根构件开展静力试验并对试验结果进行分析.结果对于长径比较大的试件,纵向受拉区柱中截面纵向CFRP先于纵向受压区柱中截面环向CFRP断裂;对于长径比较小的试件,纵向受压区柱中截面环向CFRP先于纵向受拉区柱中截面纵向CFRP断裂.试件的载荷-柱中挠度曲线可以分为弹性阶段、弹塑性阶段、塑性阶段和下降段;笔者研究对象的延性优于FRP筒内填混凝土轴压构件.结论在长径比相同的条件下,随着弯曲增强系数的增加,极限承载力提高;在弯曲增强系数相同的条件下,随着长径比的增加,极限承载力降低.在长径比相同的条件下,承载力提高率近似随着弯曲增强系数的增加而线性提高;在弯曲增强系数相同的条件下,纵向CFRP对于较大长径比试件的极限承载力提高效果比较显著.更多还原

【Abstract】 Twelve concentrically compressed concrete filled circular CFRP-steel tubular members are experimentally investigated and the test results are analyzed as well in order to understand their static performances and the influences of slenderness ratio and bending strengthening factor on the ultimate load bearing capacity and the load bearing capacity enhancement ratio.It was found that for specimens with larger slenderness ratio,longitudinal CFRP breaking at specimen middle cross-section of longitudinal tension region is earlier than circumferential CFRP breaking at specimen middle cross-section of longitudinal press region,and for specimens with smaller slenderness ratio,circumferential CFRP breaking at specimen middle cross-section of longitudinal press region is earlier than longitudinal CFRP breaking at specimen middle cross-section of longitudinal tension region.Within the factors scope of this test,the P(load)-(δ middle point deflection of the specimens) curves can be defined as the following stages:elastic stage,elasto-plastic stage,plastic stage and softening stage.The ductility of the members investigated here is better than that of the concentrically compressed concrete filled circular FRP tubular members.Under the condition that other factors are the same,the larger the bending strengthening factor,the larger the ultimate load bearing capacity,and the larger the slenderness ratio,the smaller the ultimate load bearing capacity.Load bearing capacity enhancement ratio increases nearly linearly with that of bending strengthening factor for members with the same slenderness ratio,and longitudinal CFRP has more significant affect on load bearing capacity enhancement for members with larger slenderness ratio.更多还原