With Support Cft Frame - The Core Barrel Structure Of The Simplified Calculation Method

The bracing concrete-filled steel tubular frame-core structure is a kind of structure that can provide a certain lateral rigidity and function as safety fuse in case of strong shock. The proper use of this structure endows it the merits of good lateral resisting rigidity and multiple anti-seismic ability. In order to have a better understanding of its force analysis, this paper simulates the actual structure by simplified model and does some necessary parameter analysis.The main contents include the following parts:1)Deduce the rigidity matrix of the braced steel frame by considering the flexural deformation of the pillar and the bending rigidity of the brace and then apply it into the bracing concrete-filled rectangular steel tubular frame by revising it through D method. Also, efforts have been made to the influence of such parameters as width-length ratio and ratio of beam rigidity.2)Simplified analysis of the bracing concrete-filled rectangular steel tubular frame is done by the utilization of FORTRAN programming. And then make comparison between the results that is done by the simplified methods and ETABS according to the Manual of Steel Construction Allowable Stress Design JGJ 99-98. This helps to check the validity of the simplified method. At the same time the analysis of certain parameters are done.3)Uphold the simplified calculating methods of the bracing concrete-filled rectangular steel tubular frame and its core-tube structure and then make comparison between the results that is done by the simplified methods and ETABS,which further checks the validity of this method. Efforts have been made to some important parameters and the influence they have exerted to structure.These parameters include the variety of width-length ratio of the wall,bracing rigidity, thickness of the wall and ratio of beam rigidity.This thesis carries out simplified calculation to the bracing concrete-filled rectangular steel tubular frame and its core-tube structure by making comparing between the results carried out by several diffirent methods and checks its validity. Trough the analysis of relative parameters,this paper offers reference to the preliminary design of this structure system.