The Research On Fortified Joint Of Concrete-filled Steel Tube Column To Steel Beam Connections

The joint of Concrete-filled steel tube(CFT) have been using by more and more engineering practice because of its ascendant capability now, as a result of it is taken on force logical, the joint structure is briefness and is easy to construct, the joint of exterior stiffening plate concreted-filled rectangular steel tube have amplitude development foreground. On the basic of having read abundant documentation and materials related to the joint of Concrete-Filled steel tube(CFT),this text apply finite element software named ANSYS constitute the joint model, choice proper cell, and divide gridding appropriate, then give finite element analysis on the joint, this analysis accurate describe the stress distributing of the joint area and each performance index of the joint, it can overcome the gap which has not intuitively know each detail loaded instance in experiment, the gained conclusion can supply very valuable reference to practice engineering. The main analysis content and results as follows:(1) Base six different joint finite element model of stiffening plate, compare and analyze each joint which stress distribution, damage form, hysteretic behavior, dissipative capability. By compositive contrastive analyze, the stiffening T-plate is best in compositive capability, can be preferable applied in engineering practice.(2) Analyzed the stress distribution in the length direction, the maximum stress appear in the 300mm away from the node, show that design the stiffening plate properly can ensure the plastic ream is keeping away from the node while the girder is destroyed, then carry the point that the node is strong and the member bar is feebleness, avoid the node destroyed earlily.(3) Analyzed main factors which affect T-stiffener plates joint stiffness, the effect law of the stiffness was confirmed by parameters that affect joint stiffness. The analysis indicated that there was relative rotation between the beam and the column of CFT connection with external stiffeners under the load acting on the beam. The most important factor influencing the stiffness of the connection was the height of H-beam , while the width of the horizontal stiffener had little influence on the stiffness.