方形钢骨混凝土弯扭构件非线性有限元分析

Nonlinear finite element analysis of square steel reinforced concrete bending and torsion members

为了解方形钢骨混凝土构件在弯扭复合作用下的抗扭性能,采用ABAQUS软件对7根钢骨混凝土弯扭构件进行非线性分析,通过分析得出了不同弯扭比、箍筋间距及钢骨尺寸对试件抗扭性能的影响规律。结果表明:当弯扭比n>1时,试件的破坏类型为弯型破坏,并且随着n值的增大,试件的抗扭强度逐渐减小;当弯扭比n<1时,试件的破坏类型为扭型破坏,试件抗扭强度随着n的增大而增大。通过提高试件的钢骨尺寸以及加密箍筋间距对提升试件的极限抗扭强度有一定的促进作用,但对于扭矩峰值后的延性变形影响较小。

In order to solve the torsion resistance of a square steel reinforced concrete member under the combined action of bending and torsion,the nonlinear analysis of 7 flexural and torsional members of steel reinforced concrete is carried out by using ABAQUS software.Through the analysis,the influence of the bending and torsion ratio(n),the spacing of the stirrup and the size of the steel bone on the torsion resistance of the specimen is obtained.The results show that when the ratio of bending and torsion is greater than 1,the failure type of the specimen is bending type,and with the increase of n value,the torsion strength of the specimen decreases gradually.When the ratio of bending and torsion is less than 1,the failure type of the specimen is torsional type,and the torsion strength of the specimen increases with the increase of n.By improving the size of the steel and the spacing of the stirrups,the ultimate torsion strength resistance of the test piece can be promoted,but it has little effect on the ductile deformation after the peak torque.