Analysis On The Stress Behavior Of Concrete-Filled Steel Tuber Column And Steel-Beam Joints

This paper was based on the research of an improved concrete-filled steel tube(CFT) beam-column joint with T-stiffener plates which was studied by several scholars such as Kyung-jae Shin ,Yong-ju Kim and etc in Hanyang University of Korea, by using the ANSYS three-dimensional finite element program simulate the calculation, In allusion to idiographic instance and used three-dimensional entity element, then established three-dimensional model for concrete-filled steel tube(CFT)column to H-beam joint with T-stiffener plates. Through choosing reasonable element and mesh element, stress distribution of joint zone was analyzed comparatively precise, it can cover a gap which has not intuitively know apiece of detail loaded instance in experiment, and by combining reference outcomes and the analyze ways of finite element, The analysis comparatively system to this new type joint was carried , and mainly analyzable content and fruits as follows:(1) Built five finite models which have equal dimension and same property of material (steel, concrete)with references, then calculate them respectively. Based on reference outcomes and the analysis of finite element of new type joint, the calculation value of moment-resistant carrying capacity and reference experimentally outcomes are uniform approximation. So it can certify the reliability of the analysis of finite element of concrete-filled steel tube (CFT) column to H-beam joint in this paper.(2) Analyzed main factors which affect T-stiffener plates joint stiffness The effect law of 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 thickness of the web and width of the horizontal stiffener hardly had little influence on the stiffness.(3) For seven differ concreted-filled rectangular steel tube to H-beam joints, under monotonic loading and cyclic loading was set up. The results obtained from finite analysis indicate the concreted-filled rectangular steel tube column to H-beam joint with T-stiffener plates show an excellent seismic behavior, and resistance to bending was much higher than any other of them. The failure feature is that plastic hinge was showed on beam out of the joint core zone, so, it was satisfied the principle of"stronger column with feeble beam;stronger joints with feeble bar" in code for seismic design of buildings;displacement framework curve of the T-stiffener plates joints have relative longer strengthened stage after arrive at the peak value of loading, this indicate T-stiffener plates joints have better ductility capability.(4) Discussed the effect of ratio of axial compression stress to stress performance. The results obtained from finite analyses indicate, under assured weld quality, the effect of ratio of axial compression stress to strength is relative better to moment-resistant bearing capacity of column joint, the ratio of axial compression stress to strength is bigger, the moment-resistant bearing capacity of column joint is bigger, earthquake resistant capacity is better;...