The Study On The Stiffness Of Joint Of Steel Beam To CFT Column In Frame Structure And The Effect On The Seismic Behavior Of Frame Structure

At present, it is very popular that concrete filled steel tubular (CFT) column and steel beam joint with stiffening ring is used in civil engineering construction of our country. But people often regard it as absolute rigid model or ideal hinge model when it comes to choose the calculation model of joint, which is out of accord with practical situation in civil engineering construction. There have been a great number of researches on CFT joints. But most of them focused on the ultimate resistance of certain joints. And the study on the stiffness of CFT joints has been seen seldom. As a matter of fact, the influence of joint's stiffness on the whole structure can hardly been neglected. The finite-element joint model of the CFT frame was analyzed in ANSYS. The comparison between the model of this paper and the traditional model showed the result of the former approached the test result more than the one of the latter. The geometric parameters of the finite-element model of joint were changed, through a series of analysis of the isolated CFT joint in ANSYS, in order to find out how the factors affect the performance of the connection. The affecting factors of joint were changed in the analysis of the frames , we find out how the flexibility of connections and the level of flexibility affect the behavior of the frames. Single the compute of node takes to SATWE. As a result, carry it on actual engineering a design for excellent turned a design to make it match an actual circumstance more, to provide a way of thinking and method.Moreover, the node earthquake resistance question which met generally to exist in the process, is carried on the analysis to studied, has given the node reinforcement detail drawing.In the article analysis is only restricted in the static elastic range to the node and the frame analytical study, it is considered that the node rotation rigidity the research technique preliminary discussion which affects to the overall frame displacement, may take in the future the elasto-plasticity stage analysis research foundation.