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以混凝土强度和约束效应系数为主要变化参数,对8根钢骨-钢管混凝土组合柱的工作机理、延性和极限承载力进行了试验研究,分析了影响这种组合柱性能的主要因素。研究结果表明,组合柱的承载能力随着混凝土强度等级的提高而逐渐提高;轴压组合柱的承载能力随着约束效应系数的增大而逐渐提高。由于钢管、钢骨和核心混凝土的协同工作,可大幅地提高柱子的承载能力,延缓和抑制核心混凝土中剪切斜裂缝的出现和开展,提高了柱的延性。
The working mechanism, ductility and ultimate bearing capacity of eight steel-concrete-filled steel tubular composite columns were studied by taking the concrete strength and restraining effect coefficient as the main parameters. The main factors influencing the performance of the composite column were analyzed. The results show that the bearing capacity of the composite column gradually increases with the increase of the concrete strength. The bearing capacity of the composite column with axial compression gradually increases with the increase of the restraining effect coefficient. Due to the synergetic work of steel pipe, steel bar and core concrete, the carrying capacity of columns can be greatly improved, and the occurrence and development of shear oblique cracks in core concrete can be delayed and suppressed, and the ductility of the columns has been improved.