矩形闭口钢骨混凝土构件抗扭刚度的分析

Analysis of torsional stiffness of closed rectangular SRC members in pure torsion

为研究矩形闭口钢骨混凝土纯扭构件的抗扭刚度,通过ABAQUS对以配筋率为参数的3根构件进行了有限元分析,发现配筋率对构件开裂后抗扭刚度的影响更明显.通过分析钢骨混凝土构件的扭矩-扭率曲线,可将构件的整个受力过程简化为3个阶段.基于钢筋混凝土构件、钢-混凝土组合梁的抗扭刚度计算理论和方法,同时考虑了有限元分析结果,对构件各阶段的抗扭刚度进行理论计算,将计算值与模拟值比较,吻合良好,验证了公式的正确性,可为下一步的研究提供参考.

This paper studies torsional stiffness of closed rectangular SRC members in pure torsion,with the three memebers with reinforcement ratio as parameter simulated by the finite element software ABAQUS.It is found that the influence of reinforcement ratio on the torsional stiffness after cracking is more obvious.By analyzing the torque-torque curve of SRC members,the whole stress process of members can be simplified to three stages.The theoretical calculating of torsional stiffness of each stage was based on the torsion stiffiness calculating theory and method of reinforced concrete members and steel reinforced composite concrete beams,as well as the results of finite element analysis.By comparing the calculation values with the simulation values,they are in good agreement.So the accuracy of the formula is verified.At the same time,it also provides a reference to the next step.