型钢高强混凝土柱轴压比限值的试验研究

通过20个型钢高强混凝土柱的低周反复加载试验对其受力性能进行了研究，分析了剪跨比、轴压比、配箍率以及混凝土强度对型钢高强混凝土柱延性的影响，提出了不同剪跨比、不同配箍率的型钢高强混凝土柱的轴压比限值。其中，剪跨比大于2．0的型钢高强混凝土柱的轴压比限值由大、小偏心界限破坏时力的平衡条件并结合试验结果确定，而剪跨比小于2．0的型钢高强混凝土柱的轴压比限值则通过与剪跨比大于2．0的型钢高强混凝土柱的延性对比加以确定。

Experimental study on the limit values of axial compressive ratio of steel section high-strength concrete columns

Low cyclic reversed loading tests of 20 specimens of section steel high-strength concrete columns were carried out to investigate its ductility and limit values of axial compressive ratio. The influences of shear span ratio, axial compressive ratio, stirrup ratio and concrete strength on the ductility have been analyzed, and the limit values of the axial compressive ratio of the section steel high-strength concrete columns under different shear span ratio and stirrup ratio are proposed. For the section steel high-strength concrete columns with shear span ratio larger than 2. O, the limit value of the axial compressive ratio is determined based on the test results and the equilibrium condition of forces under balanced failure ; while for ones with shear span ratio less than 2. 0, its limit value is obtained through the comparison of the ductility coefficients of specimens with shear span ratio less than 2. 0 with those of specimens with shear span ratio larger than 2. 0.