The Seismic Performance Analysis Of Steel Reinforced Concrete Beam Transfer Story Structure

In high-rise buildings, in order to meet the large space building functionrequirement at the lower part and small space building function requirement at the upper,the structure often is set transfer layer in the floor having spatial variation. At present, thecommon transfer layer structure form mainly include beam type transfer, the thick platetransfer, box type transfer, truss transfer, especially, the beam type transfer layer is themost widely used in our country for stress simple, clear load transfer, construction isconvenient, the weight is relatively light, but the transfer component has larger sectionsize and greater weight. Steel reinforced concrete beam type transfer as a transfer layer ofthe future development trend, which not only has the advantages of beam type transferlayer, but also overcomes its shortcomings, but due to the transfer layer structure lacks ofsystematic research, its practical application is limited, so doing the in-depth study to thesteel reinforced concrete beam type transfer layer has important significance.This paper establishes a structure finite element model of a18-storey high-risebuilding with steel reinforced concrete beam transfer layer using finite element analysissoftware SAP2000, and then do the elastic analysis under the common earthquake,mainly including modal analysis、response spectrum analysis、elastic time historyanalysis, basing on the finite element model, through changes the steel reinforcedconcrete beam transfer layer setting position、equivalent shear stiffness ratio between thetransfer layer up and down、steel ratio of the transfer beam,studys the effect of the steelreinforced concrete beam transfer layer setting position、equivalent shear stiffness ratiobetween the transfer layer up and down、steel ratio of the transfer beam on structuredynamic characteristics and dynamic response using the modal analysis and responsespectrum analysis. In addition, the effect of steel reinforced concrete beam type transferlayer position on the shear and moment distribution between the shear wall and framesupported shear wall and transfer beam steel ratio on transfer beam bearing capacity isalso discussed. Finally, some important conclusions are obtained:(1) In this paper, the maximum interlaye displacement、the interlayer displacementangle、the total seismic shear and the total seismic moment of the structure analyzed bythe bottom shear method are larger than that analyzed by response spectrum analysis, butthe difference is not too big. Therefore, the high-rise building structure with steelreinforced concrete beam transfer layer still can be calculated by the bottom shear method when its main deformation is the shear deformation and its mass and stiffness isquite uniform along the height distribution and although its height is more than40m,more than not too big.(2) In this paper, the maximum value and the average value of the maximuminterlaye displacement、the interlayer displacement angle、the total seismic shear and thetotal seismic moment of the structure analyzed by the elastic time history analysismethod are larger than that analyzed by response spectrum analysis. Therefore, it isnecessary to do the elastic time history analysis for the high-rise building structure withsteel reinforced concrete transfer beam.(3) With the steel reinforced concrete beam transfer layer setting position improve,the structure natural vibration period becomes longer gradually, but smaller changes; thestructure vibration curve is basically the same; the structure interlayer maximumdisplacement increases gradually; the structure base shear has different degrees ofincrease and decrease; the structure base moment decreases gradually, but the higher thetransfer layer is, the smaller the base moment changes when increase the same number ofconversion; shear and moment distribution between the shear wall and frame supportedshear wall changes little.(4) With the equivalent shear stiffness ratio between the transfer layer up and downincreases, the structure natural vibration period becomes shorter gradually, but smallerchanges; the structure vibration curve is basically the same; the structure interlayermaximum displacement decreases gradually, and the more thick the shear wall is, thesmaller the maximum interlayer displacement changes when adding up to the samethickness; the structure interlayer displacement angle in the transfer layer at lower layersdecreased gradually, in the upper layers changed little; the total seismic shear and thetotal seismic moment all gradually increased, but the thicker the shear wall is, the smallerthe total seismic shear and the total seismic moment change, when increasing the samethickness,.(5) With the steel ratio of transfer beam increase, the changes of the naturalvibration period and the vibration mode of a structure、 the interlayer maximumdisplacement and the interlayer displacement angle of each layer、the seismic total shearand the seismic total moment are so small that they can be ignore, but the moment and shear bearing capacit y of t hetransfer bea mi mprove significantly.