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为了研究主管壁局部加厚对方钢管T型节点滞回性能的影响,对一个主管壁局部加厚的方钢管T型节点试件和一个主管壁未加厚的方钢管T型节点试件进行试验测试和有限元模拟。试验中,通过控制支管的竖向位移对方钢管T型节点试件施加低周往复循环荷载,研究试件的变形和破坏模式,并进行相关抗震性能指标(延性系数和能量耗散)分析。试验结果表明:主管壁局部加厚能够明显改善节点的滞回性能,同时能够使节点由带有明显延性特征的断裂破坏转变为主管壁厚改变处的延性屈服破坏。利用有限元软件ANSYS对试验试件进行有限元模拟,结果与试验结果吻合较好。最后利用有限元软件分析了主管壁加厚方钢管T型节点加厚参数(主管的加厚长度l和加厚厚度Δt)对节点滞回性能的影响。分析结果表明:为了改善节点滞回性能,加厚长度不超过支管截面边长的3倍,加厚厚度不超过主管壁厚的0.8倍。
In order to study the influence of local thickening of the main wall on the hysteretic behavior of the T-shaped joints of other steel pipes, a T-shaped joint specimen with a locally thickened main wall and a T-shaped joint with an un-thickened square steel tube were tested Testing and Finite Element Simulation. In the experiment, the cyclic deformation of the T-joints of the square steel pipe was controlled by controlling the vertical displacement of the branch pipe. The deformation and failure modes of the test piece were studied. The relevant seismic performance indexes (ductility coefficient and energy dissipation) were analyzed. The experimental results show that the local thickening of the main wall can obviously improve the hysteretic behavior of the joint, and at the same time, the node can be changed from the fracture with obvious ductile characteristics to the ductile yield failure with the change of the wall thickness. The finite element software ANSYS was used to simulate the test specimen. The result is in good agreement with the experimental result. Finally, the influence of thickening parameters (thickening length l and thickening thickness Δt) on the hysteretic behavior of the joints was analyzed by finite element software. The analysis results show that in order to improve the hysteretic behavior of the joints, the length of the thickened part does not exceed 3 times of the length of the side section of the branch pipe, and the thickened thickness does not exceed 0.8 times of the wall thickness of the main pipe.