论文部分内容阅读
为了研究配螺旋箍筋方钢管混凝土柱的力学性能,在试验基础上应用ABAQUS软件建立了方钢管混凝土柱的有限元模型,对比分析了配螺旋箍筋方钢管混凝土柱与普通方钢管混凝土柱的力学性能,得到螺旋箍筋对混凝土具有约束加强作用的影响规律。在此基础上,进一步对配螺旋箍筋方钢管混凝土柱进行参数化分析,研究了混凝土强度等级、螺旋箍筋间距、螺旋箍筋直径、螺旋箍筋强度等级对配螺旋箍筋方钢管混凝土柱轴压承载力的影响。结果表明:提高混凝土强度等级、减小螺旋箍筋间距和增大直径均能有效提高配螺旋箍筋方钢管混凝土柱的轴压承载力,而改变螺旋箍筋强度等级对提高配螺旋箍筋方钢管混凝土柱的轴压承载力效果不明显;配螺旋箍筋方钢管混凝土柱的轴压承载力与其用钢量近似成正比关系。在相关规范的基础上,推导了适用于配螺旋箍筋方钢管混凝土柱的轴压承载力计算公式,并验证了其合理性。
In order to study the mechanical properties of CFST columns with helical stirrups, a finite element model of square concrete filled steel tubular columns was established by using ABAQUS software on the basis of experiments. The concrete-filled square steel tube columns with helical stirrups were compared with that of common square concrete filled steel tubular columns Mechanical properties, get spiral stirrups reinforced concrete has a strengthening effect of the law. On this basis, the parametric analysis of CFST columns with helical stirrups was further carried out. The effects of concrete strength grade, spacing of spiral stirrups, diameter of spiral stirrup and strength of spiral stirrup on the square concrete filled steel tubular columns with helical stirrup Effect of Axial Bearing Capacity. The results show that increasing the strength level of concrete, decreasing the spacing between spiral stirrups and increasing the diameter can effectively increase the axial compressive bearing capacity of CFST columns with helical stirrups. However, The axial compressive bearing capacity of CFST columns is not obvious. The axial compressive bearing capacity of CFST columns with spiral stirrups is approximately proportional to the amount of steel used. Based on the relevant specifications, the formula for calculating the axial compressive bearing capacity of concrete filled square steel columns with spiral stirrups is deduced and its rationality is verified.