钢筋混凝土柱的临界轴压比与轴压比限值

Critical and limit values of axial compression ratio for RC column

从钢筋混凝土基本原理出发,重新推导了对称配筋矩形柱的临界轴压比公式,结果表明:临界轴压比设计值应为0.5左右,取决于截面材料属性,而非0.9;临界轴压比的设计值与标准值之比稍大于1.0,而非荷载分项系数与材料分项系数之乘积1.63。通过PM相关曲线的简单数值算例对推导结果进行了验证,并采用约束混凝土本构模型对规范轴压比限值进行了相关讨论。

The critical axial compression ratio of rectangular reinforced concrete(RC)column with symmetrical reinforcements was re-derived based on the basic principle of RC.The results show that this design value of this ratio for should be 0.5 or so,depend on those material properties of the section,instead of 0.9,and the ratio of design value to the characteristic value of this ratio is just more than 1.0,instead of the product of the partial factor for loads and the partial factor for materials,i.e.,1.63.In order to verify these results a simple numerical example was given byPMinteraction cure.The limit value of axial compression ratio from the design codes was also discussed by the confined concrete model.