Nonlinear Static Analysis Of R. C.Frame Structure With Special-shaped Columns

Beause of good architectural function, R.C. frame structure with spacial-shaped conlumns has got relatively extensive application in the recent years. However, as a kind of comparatively new structural system, it has never experienced the test of earthquake. The evaluation method and research of the analysis of its nonlinear analysis deformation and the anti-seismic performance has shortages under large earthquake for this kind of structure.Currently in the section nonlinear analysis of spacial-shaped columns, the influence of section ductility has been only confined with factors such as axial compression ratio, load angle, stirrup space, the ratio of stirrup and concrete strength grade but without considering long breadth ratio. This paper will take account of long breadth ratio to the influence of section ductility in addition to consideration above other factors. Then the numerical integration method has been applied in the section nonlinear analysis by the MATLAB language and the curvature ductility ratio of L shape,T shape and + shape is calculated from it, and the influence of section ductility is argued under those factors. The reasonable long breadth ratio of the better ductile section is gained from the contrastive analysis.The nonlinear static analysis of a R.C. frame structure with special-shaped columns and a R.C. frame structure with rectangular columns under the same conditions by the progaram SAP2000 has got the relation of base shear -top displacement and the deformed results of the floors and the occurrence sequence of plastic hinges and their distribution. This paper suggests that R.C. framed structure with special-shaped columns has relatively good ductility and the anti-seismic performance if through reasonable structural arrangement. At the same time, it suggests that for the regularly structural and multistory building, the nonlinear static analysis is a currently reasonable and accurate simplified way that evaluates the anti-seismic performance of structure compared to the complexity of nonlinear dynamic analysis...