Finite Element Analysis On The Hysteretic Behavior Of The Welded Haunch Reinforced Connection With Boxstrengthen Joint Region In Fringe Frame For Weak Axis Of I-section Column

With the increasing emphasis on the safety of steel frame beam-column joints, more and more relative researches has been deepen and improved, while most of the research achievements concentrate on the strong axis and very small part involves weak-axis. On the basis of the previous research, which is Experimental Research on Welded Haunch Reinforced of Box Strengthen-joint Region Connection for Weak Axis of I-section Column under Monotonic Loading, this paper studies hysteretic behavior of the new joint connection for weak axis under cyclic loading by using finite element analysis software ABAQUS 6.11.All the joints in this paper belong to fringe frame node of pure steel, including standard column beam connection, bottom haunch connection, top and bottom haunch connection,bottom haunch and top cover plates connection, the weld steess modified connection. This paper takes variable parameters analysis on such factors as axial compression ratio of the column, the slipping coefficient of interfaces, the height and thickness of the column covering plates, steel material, the thickness of column web, the moment of strong axis, column and beam linear stiffness. The failure mode, development law of the plastic hinges, stress distribution of panel zone and covering plates for all connection methods were obtained through the analysis and the data processing, so as to the node parameters like the moment and rotation curves, skeleton curves, initial rotation stiffness, bearing capacity, rotative ductility and plastic rotation. These connections were also classified by the rotation stiffness,some design suggestions were proposed for relative connections according to the analysis.The finite element analysis shows that the effect on the ductility created by axial compression of the column can not be neglected when the ratio is over 0.5, and the axial compression ration of column in the new connection for weak axis should not exceed 0.7. The slipping coefficient of interfaces has a huge effect on the ductility while little effect on other joint behavior. The thickness of covering plates has a significant effect on the joint behavior and connection security, the lamellar tearing resistant steel is suggested when the covering plates is very thick.The height of the covering plates has almost no effect on the joint behavior. The ductility will decrease with the use of high strength steel. The moment of strong axis has a small effect on the joint behavior of weak axis. The initial rotation stiffnesswas mainly decided by column section and thickness of the covering plates. It is proper to take value from the ranks of 1.0 as the column beam linear stiffness ratio. The bottom haunch connection has a larger bearing capacity and rotation stiffness than standard column beam connection. The bottom haunch and top cover plates connection has a good performance on the joint behavior and connection security with decreasing the thickness of covering plates. The weld steess modified connection can improve the weld stress conditions,decreasing risks of brittle breaks of weld at the same time. The width of covering plates has a limited effect on the top and bottom connection.As the supplement and perfection of the Box Strengthen-joint Region Connection for Weak Axis of I-section Column, the research contents of this paper provide reference for follow-up study.