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为研究钢管高强混凝土柱轴压性能,以混凝土强度和长径比为变化参数设计5个试件进行轴心受压加载试验,并与空钢管和素混凝土试件进行对比。试验结果表明,钢管高强混凝土试件和空钢管试件的破坏形态呈腰鼓形破坏,素混凝土试件的破坏形态为纵向劈裂破坏;除素混凝土试件外,所有试件荷载-轴向变形曲线的变化趋势基本相似,都经历上升段、下降段、再回升段三个历程;钢管高强混凝土试件的极限承载力随核心混凝土强度的提高而增大,随长径比的增大而降低。采用统一强度理论和套箍理论提出的计算方法对钢管高强混凝土柱承载力进行计算发现,《钢-混凝土组合结构设计规程》(DL/T 5085—1999)和《钢管混凝土结构技术规程》(CECS 28∶2012)的计算结果与试验结果吻合较好,可用于钢管高强混凝土柱的设计。
In order to study the axial compressive property of high-strength concrete filled steel tubular columns, five specimens were designed and tested under axial compressive loading with concrete strength and aspect ratio as the changing parameters. The test results show that the failure modes of the specimens of high-strength concrete-filled steel tube and those of the empty steel tube show a waist drum-shaped failure, and the failure mode of the plain concrete specimen is the longitudinal splitting failure. Except for the concrete specimens, The trend of the curves are basically similar and all experienced the three stages of ascending section, descending section and then rising section. The ultimate bearing capacity of high-strength concrete filled steel tubular specimens increased with the increase of the core concrete strength and decreased with the increase of the aspect ratio . The calculation method based on the unified strength theory and the hoop theory is used to calculate the bearing capacity of the high strength concrete filled steel tubular columns. It is found that the design rules of “steel-concrete composite structure design” (DL / T 5085-1999) and "CECS 28:2012) is in good agreement with the experimental results and can be used in the design of high-strength concrete filled steel tubular columns.