Structural Influence Coefficient Of Steel Special-shaped Column Frame Structure

When steel structure is adopted in residential design,the structural system generally adopts H-shaped steel,which will make the column angle of the structure protrude from the wall in the room,which will occupy a certain amount of indoor space and affect the beauty of the building.In order to solve this problem,engineers designed a special shape of steel column,such as T-shaped cross-section steel special-shaped column used in the side column,cross-section steel special-shaped column used in the center column,can solve the problem of the column angle in the room.problem.The research on the structural influence coefficient in our country mainly focuses on the frame structure,and there is no research on the special-shaped column frame structure of the steel structure.Therefore,this thesis studies the structural influence coefficient of this structure to make up for the gap in the structural influence coefficient of this structure.Comparing the value of the influence coefficient of foreign steel frame structures with the structure influence coefficient of the implicit steel frame in my country’s "Code for Seismic Design of Buildings"(GB50011-2010),it can be found that my country adopts a single structural influence coefficient for all structural systems of different materials.,This is not entirely reasonable.Therefore,this paper proposes suggested reference values for the structural influence coefficient of the special-shaped column frame structure of steel structure through modeling calculation analysis.This article first uses Midas-Gen software to establish four different floors of steel structure special-shaped column frame structure models,the number of floors are 3,6,9 and12 respectively.Then through the Pushover module in the software,the static pushover analysis of the above four groups of models is carried out.According to the analysis of the results obtained from the static pushover,R’ is calculated,and then the calculated R’ is compared with the implied R in the specification.If the difference is less than 5%,it indicates that the R specified in the specification is accurate.If the difference exceeds 5%,this also indicates that there is a problem with the R specified in the specification.It is necessary to first assume that the structural influence coefficient is R’,and then multiply the seismic action by the coefficient R’/R for adjustment and re-design analysis calculations.Finally,a new structural influence R’’ is obtained until the R’’ and R’’ obtained by the Pushover method are analyzed and calculated.Assuming that the difference of R’ does not exceed 5%,the structural influence coefficient of this model can be obtained.Through this method,the structural influence coefficients of the four groups of models are calculated.The results show that the value of seismic action of the steel frame structure with multi-storey special-shaped columns is too large when it is designed according to the Code for Seismic Design of Buildings(GB50011-2010)in China,and it is suggested to reduce it appropriately.This article also push static pushover analysis,the four model through displacement load control after four models of the internal force curve and the demand curve,and then calculates the structure of the structure of the influence coefficient,structural ductility coefficient and super structure coefficient and the displacement amplification coefficient,finally found that with the increase of several floors building,structure influence coefficient,The displacement amplification coefficient and structural strength coefficient decrease,while the structural ductility coefficient increases.The paper also studies the plastic joints of steel frame structures with special-shaped columns.It is found that the internal forces of the first layer beam increase fastest and the plastic joints appear the earliest under earthquake action.The first layer beam is the weak part of the structure under earthquake action,which provides a reliable basis for the seismic design and structural reinforcement of such structures.