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对自密实混凝土和普通混凝土填充圆形钢管柱在集中荷载下的破坏形态进行了研究。对比了4种测量试件轴心变形的方法。采用17个试件试验来分析混凝土强度、有凹口的洞或孔、不同加载条件对柱的极限承载力以及荷载变形曲线的影响。讨论了这些短柱在约束条件下的性能。对于全截面承载的构件,不同规格的应变仪能够记录钢管应变;有一定量程的电子位移传感器可以记录轴向位移。采用高强混凝土时,对于全截面承载试件,极限承载力显著增加,但是,破坏后的残余力几乎恒定。然而,一旦钢管带凹口,试件的轴向压缩刚度减少;在某些情况下,极限承载力也减低,钢管起到横向限制的作用而不是轴向的约束。对于没有凹口、用普通混凝土和自密实混凝土填充的圆形钢管柱,当试件全截面承载时,欧洲规范4预测出了合理的承载力。
The failure modes of self-compacting concrete and plain concrete filled circular steel column under concentrated load were studied. Four methods of measuring the deformation of the axis of the specimen were compared. 17 test specimens were used to analyze the influence of concrete strength, notched holes or holes, the ultimate bearing capacity of columns and load deformation curves under different loading conditions. The properties of these short columns under the constraint conditions are discussed. For members with full cross-section, strain gauges of different sizes can record steel tube strain; a range of electronic displacement sensors can record axial displacement. When using high-strength concrete, the ultimate bearing capacity of the specimen with full cross-section increases significantly, however, the residual force after failure is almost constant. However, once the steel pipe is notched, the axial compressive rigidity of the specimen decreases; in some cases, the ultimate bearing capacity is also reduced, and the steel pipe acts as a lateral restraint rather than an axial restraint. For circular steel columns without recesses, filled with normal concrete and self-compacting concrete, the European Code 4 predicts a reasonable bearing capacity when the specimen is carried over its full cross-section.