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基于ABAQUS软件,建立了圆形、方形及矩形钢管混凝土构件在纯扭矩作用时的数值模拟模型,并采用已有研究者完成的圆形及方形构件扭转试验结果对理论模型进行了验证,理论计算结果和试验结果总体上吻合良好。基于此理论模型,对影响矩形钢管混凝土构件扭转力学性能的主要因素进行了分析,考虑了钢材强度、混凝土强度、含钢率和截面高宽比等的影响。结果表明,钢材强度及混凝土强度只影响矩形钢管混凝土纯扭构件的Tθ关系曲线数值,对其形状影响不明显,含钢率和截面高宽比对Tθ关系曲线的数值和初始刚度都有影响。在参数分析的基础上建议了矩形钢管混凝土构件抗扭强度承载力计算公式。
Based on the ABAQUS software, numerical simulation models of circular, square and rectangular CFST members subjected to pure torque are established. The theoretical model is verified by the torsion test results of circular and square members completed by the existing researchers. The theoretical calculation The results are in good agreement with the test results. Based on this theoretical model, the main factors affecting the torsional mechanical properties of rectangular CFST members were analyzed, and the effects of steel strength, concrete strength, steel content and aspect ratio were considered. The results show that the strength of steel and the strength of concrete only affect the value of Tθ curve of the pure Torsion member of rectangular CFST, and have no obvious effect on its shape. The steel ratio and the aspect ratio have influence on the value and initial stiffness of Tθ curve. On the basis of the parameter analysis, the formulas for calculating the bearing capacity of torsional strength of CFRST members are proposed.