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通过有限元分析软件ABAQUS对7根钢骨混凝土构件进行模拟分析,得到了不同影响因素作用下的扭矩-扭率曲线。将钢骨混凝土构件的扭矩-扭率曲线简化为三个阶段:开裂前的弹性阶段、弹塑性阶段和破坏阶段。结合钢筋混凝土构件的抗扭刚度计算理论和方法,依据有限元分析结果,考虑了钢骨部分分别在开裂前、极限状态时的刚度修正系数及轴压比对开裂前钢筋混凝土部分刚度的影响系数,建立了钢骨混凝土构件开裂前、屈服时以及极限状态时的抗扭刚度计算公式。通过对比有限元值与公式值,初步验证了公式的正确性。
The finite element analysis software ABAQUS was used to simulate and analyze the seven steel reinforced concrete members. The torque - torsion curves under different influence factors were obtained. The torque-torsion curve of SRC is simplified into three stages: elastic stage, elasto-plastic stage and failure stage before cracking. According to the calculation theory and method of torsional stiffness of reinforced concrete members, the influence factors of stiffness correction coefficient and axial compression ratio on the stiffness of reinforced concrete before cracking are taken into account based on the finite element analysis results. , The formulas for calculating the torsional stiffness of the SRC before cracking, yielding and the ultimate state are established. By comparing the finite element value and the formula value, the correctness of the formula is verified.