不同约束范围下的钢骨混凝土纯扭构件的抗扭刚度研究

Research on torsional stiffness of SRC pure torsional components in different constraints range

采用有限元分析软件ABAQUS对不同约束范围下的钢骨混凝土构件的抗扭刚度进行研究,通过分析扭矩—扭率曲线得出:在构件开裂前的阶段,约束范围的变化对构件抗扭刚度影响较小;而在构件开裂后,约束范围的增加对构件抗扭刚度有一定的增益效果。在结合钢筋混凝土结构、钢-混凝土组合结构以及变角空间桁架理论的基础上,提出了钢骨混凝土纯扭构件的抗扭刚度计算公式,并将理论计算值与有限元值对比,初步验证了该计算公式的准确性。

The torsional stiffness of SRC components in different constraint range was studied by using the finite element analysis software ABAQUS. Through the analysis of the torque and torsion curve, it is concluded that, before the component cracking stage,the change of the constraint range has little effect on the torsional rigidity of the compo- nent,while after component cracking,the increase of constraint range has a certain gain effect on torsional stiffness of the components. Based on the theories of reinforced concrete structure, steel-concrete composite structure and varia- ble angle space truss, the torsional stiffness calculation formulae for the steel reinforced concrete pure torsional com- ponents was put forward, the theoretical calculation value and the finite element value were compared, and the accura- cy of the formula was verified.