Set The Framework Of The Steel Truss Transfer Stories - The Flexibility Of The Core Wall Structure Seismic Performance Analysis

For larger space and more capabilities which owned by the buildings,the structure of transfer story are used more and more to design.The structure of steel transfer trusses which is irregular and complex,they have many merits,for example,clear-edge,clear-channel capability,but structure and construction are complicated,the transfer story under earthquake load will change easily into weak formation,it is the most drawback.The crucial point of my thesis is to study the structure with steel transfer trusses, the contents of my thesis are:(1)Establish modals of 2-D steel transfer trusses, using finite element software SAP2000, compare the difference between monolayer-steel transfer trusses and lapper-steel trusses when longitudinal static loads exert on them,then get the best results from the two forms;through changing the upper and the lower stiffness of the steel transfer trusses,get the mechanical properties.(2)We must guarantee similarities of the upper and lower stiffness and deformation,the transfer story own suitable the ratio of equivalent lateral stiffness,in the meantime,strengthen the lower stiffness and abate the upper stiffness as far as possible;calculate the ratio of equivalent lateral stiffness of the steel transfer trusses, and the result must meet the standard requirement.(3)Establish a frame-core wall structure with steel transfer trusses, analysis dynamic characteristics using finite element software SAP2000, for example,period,modal,modal participation factors,modal participating mass ration etc;through response spectrum and time history,analysis action under frequent seismic,the differences of the displacement, inter-layer driff angle, the shear, layer shear and other aspects of the performance are compared; at last, analysis axial force of the steel truss transfer story when time waves imposed the structure.(4)Then establish three modals,install individually three trusses to the third floor,the sixth floor,the ninth floor of the three modals,analysis dynamic characteristics and eastic seismic characteristics of these modals,the differences of the period, modal, the displacement and layer drift and inter-layer drift angle,the shear and layer shear and other aspects of the performance are compared.