Research On Optimal Design Of The Existing Building External Put Up Steel Structure Elevator

With the rapid development of society,the development of Chinese architecture has reached well-off level,ameliorating people’s existing life quality and improving the service function of existing buildings,which has become people’s increasing good life demand.Due to historical reasons,there are quite a number of high-rise existing buildings which are not equipped with elevators,which bring inconvenience to people’s daily life and work.The elevator shaft structure with additional elevator outside the existing building mainly includes reinforced concrete structure and steel frame structure.The steel frame structure has the advantages of light weight,good ductility and good seismic performance,taking into account the steel frame structure itself is easy to assemble,conforming to the development concept of building industrialization,which makes the steel frame elevator shaft structure favored by Party A and designers.At present,the steel frame elevator shaft structure adopted mainly the pure steel frame structure system taking welding connection and using the square steel pipe as the main material in the actual project.However,the support steel frame structure system using H steel as the main material by welding conne ction is relatively small.The steel section size is larger in the pure steel frame elevator shaft structure system,it is based on the amount of materials sacrificed to obtain structural stability,the design is too conservative and the steel purchase is high.Therefore,on the premise of guaranteeing structure’s good performance,it is necessary to optimize the design for the structure.The main work of this paper is as follows:(1)In the background of adding a steel structure elevator project to a 6 sto ry existing building of Sichuan Province,the static elastic and elastoplastic design analysis is carried out by the Midas Gen software.Through analyzing the cycle and vibration type,layer shear and shear weight ratio,lateral displacement,vertical deformation,component section strength,curve of base shear-peak displacement,performance point information and plastic hinge distribution to determine whether the structure can resist the standard values of wind load,frequent earthquakes and rare earthquak es.(2)According to the analysis results for the actual engineering,a kind of supporting steel frame elevator shaft structure is optimized by changing the section form and adding support,and the static elastic and elastoplastic design analysis is carried out.By analyzing the indicators of the structure to determine whether the structure meets the design requirements of specifications,and whether it can resist wind load standard values,frequent earthquakes and rare earthquakes.(3)The performance and economy of the two kinds of structures are compared and analyzed.Based on the static elastic and elastoplastic analysis results of the two structures,the mechanical properties of the structure are qualitatively evaluated,and the economic performance of the structure is quantitatively evaluated from two aspects of steel volume and direct cost.(4)By changing the node stiffness,the seismic performance of semi-rigid connection supporting steel frame elevator shaft structure is analyzed,and the influence degree of different node stiffness on the seismic performance of the structure is given,so as to provide reference for engineering design and construction.