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为研究方中空夹层钢管混凝土柱在压-弯-剪复合受力下的力学性能,以剪跨比、轴压比和空心率为主要变化参数,设计了4个方中空夹层钢管混凝土柱和1个方实心钢管混凝土柱进行试验研究,对其破坏形态、水平剪力-应变曲线、水平剪力-位移曲线等进行分析,研究了剪跨比、轴压比和空心率等参数对柱受剪性能的影响。试验结果表明:剪跨比为1.0的柱发生剪切破坏;剪跨比为2.0的柱发生弯曲破坏;剪跨比为1.5的柱发生弯剪破坏。5个不同参数的柱中,变化参数剪跨比(λ为1.0,1.5,2.0)时,剪跨比大的柱刚度及受剪承载力低,延性更差;变化参数轴压比(n为0.12,0.23)时,轴压比大的柱受剪承载力略低;变化参数空心率(χ为0,0.39)时,方中空夹层钢管混凝土柱的受剪承载力比实心钢管混凝土柱的略高,但延性稍弱。
In order to study the mechanical properties of hollow concrete-filled CFST columns subjected to compression-bending-shear compression, the shear strength ratio, axial compression ratio and hollowness were taken as the main parameters. Four square concrete-filled steel tube columns Square concrete filled steel tubular columns were studied and their failure modes, horizontal shear-strain curves and horizontal shear-displacement curves were analyzed. The effects of shear span ratio, axial compression ratio, The impact of performance. The test results show that the shear failure occurs on the column with shear span ratio of 1.0, the bending failure occurs on the column with shear span ratio of 2.0, and the shear failure occurs on the column with shear span ratio of 1.5. In the columns with different parameters, the shear span ratio (λ = 1.0, 1.5, 2.0) of the parameters varied with low shear stiffness and shear strength, and the ductility was worse. The axial compression ratio (n 0.12, 0.23), the shear bearing capacity of the column with axially compressive concrete filled steel tubular columns is much lower than that of the concrete filled steel tubular columns with varying axial void ratio (χ = 0,0.39) High, but ductility weaker.