Study On Seismic Property Of High-rise Buildings With Girder Transfer Floor

With the steady growth in the high-rise building with transfer floor, the girdertransfer floor is the most commonly used form in the transfer structures and widely usedin high-rise structures. In recent years, significant achievements have been received incomplex high-rise structures with girder transfer floor in our country.The research on the seismic performance of this type of building structure is stillconcentrated in the elastic stage, which is still immature when it comes to thestructural’s nonlinear seismic performance, while the location of the transition floor andthe equivalent stiffness ratio from the top to the bottom of transfer floor are still twoimportant factors which influence the construction. It is spent further research that twofactors how to affect the structural’s seismic performance.This thesis which is based on the former research on the seismic performance inthe complex high-rise structures with girder transfer floor is carried out, and the mainlyresearch content as followed:(1) The calculation method of the seismic analysis theory and its development, thecurrent theoretical study on the high-rise structures with transfer stories and currentstandard on its design principles are summarized.(2) According to the different heights and the equivalent stiffness ratios of transferfloor, different finite element models of frame-supported shear wall structure have beenestablished with the help of the finite element analysis software of SAP2000. Throughthe comparison and analysis of the modal, floor displacement angle and force curve, thecurve of top displacement and acceleration of structures, the internal force of transferbeam and frame column, etc. the influence of the two factors on this type of structure in the seismic performance of elastic stage can be studied.(3) According to the different heights and the equivalent stiffness ratios of transferfloor, different spatial models of frame-supported shear wall structure have beenestablished with the help of the finite element analysis software of SAP2000. Throughthe comparison and analysis of the floor displacement angle and force curve, the curveof top displacement, the plastic hinge distribution map, the plastic hingemoment-rotation curves and the basal resistance-storey lateral hysteretic curve in orderto analysis of the seismic performance comparatively, the influence of the two factorson this type of structure in the seismic performance of elastic plastic stage can bestudied.Through the research, if the complex high-rise building structure with beamtransformation layer suffered more severe earthquake action in the elastic stage, thetransformation layer’s floor number should be of little value as appropriate, theequivalent stiffness ratio should be1.0or less advisable; If structures subjected tosevere seismic action in the elastic-plastic stage, several floors of the conversion layerand now the value of n should be appropriate and moderate should not be too big or toosmall, The equivalent stiffness ratio should be meet the specification requirements <1.0under the premise of can take appropriately small value, but should not be too small toavoid close to lower limit requirements. So when during the structure design of the type,the transformation layer’s floor number should not take great value on the basis ofappropriate values, not deliberately take small value, the equivalent stiffness ratioshould be in meet the under the premise of1.0or less may be appropriately reduced,need not deliberately make its value close to1.0.