钢骨混凝土压扭构件的抗扭刚度计算分析

Calculation and analysis on torsional stiffness of steel reinforced concrete members subjected to compression and torsion

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。

In this paper, seven steel reinforced concrete members were simulated and analyzed by finite ele- ment analysis software ABAQUS, and the torque - twist curve under different influence factors was obtained. The torsional stiffness of steel reinforced concrete members could be simplified to three stages：elastic stage before crack- ing, after cracking to steel reinforced concrete members yield, after yielding to limit state. Based on the calculation theory and method of torsion stiffness of reinforced concrete members , according to the results of finite element anal- ysis and considering the correction coefficient of steel stiffness before cracking and under limit state and effect of axial compression ratio on the stiffness of reinforced concrete before cracking, the calculation formulas of torsional stiffness of three state were established. By comparing the finite element values and the formula values, the correctness of the formula was verified.