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以箍筋间距、箍筋形式和偏心矩为变化参数,对10根高强箍筋约束高强混凝土柱进行偏心受压试验,研究这类柱的偏心受压性能。通过试验,观察高强箍筋约束高强混凝土柱分别在大小偏心受压时的破坏过程与破坏形态,并记录各个试件荷载挠度曲线;各个加载阶段的截面应变分布;对比分析各个试件的弯矩-曲率关系曲线;试验表明:箍筋间距较小的高强连续复合箍筋约束高强混凝土柱具有非常好的延性性能,且试验测得柱的受压承载能力均高于按现行规范的计算值;采用约束混凝土本构关系对试件进行截面分析,得到弯矩-曲率关系曲线,且与试验曲线吻合较好。
Taking the stirrup spacing, stirrup form and eccentric moment as parameters, 10 eccentric high-strength concrete columns subjected to high-strength stirrup reinforcement were subjected to eccentric compression tests to study the eccentric compression behavior of such columns. Through the test, the failure process and failure mode of high-strength concrete columns confined by high-strength stirrups under eccentric compression were observed, and the curves of load deflections of each specimen were recorded. The strain distribution of each section was recorded. - curvature curve. The test shows that the high strength continuous concrete confined high strength concrete columns with small stirrup spacing have very good ductility, and the compressive loading capacity of the tested columns is higher than that calculated according to the current codes. The constitutive relation of confined concrete was used to analyze the cross section of the specimen, and the bending moment - curvature curve was obtained, which was in good agreement with the experimental curve.