Study On Mechanical Behaviors Of High-rise Beam Transfer Story Structures

In order to meet the demand of structure which is large space in lower parts and small space in upper parts, a new type with a beam transformation layer structure arise at the historic moment.The stress performance of such conversion layer structure is complex and it is crucial for the safety,which has important engineering application value on mechanical performance research of transfer beam.This paper based on a project example of Shanxi Ankang, using the finite element software SATWE and ANSYS to establish different theoretical models, analysis of dynamic characteristics and seismic response of the model and elastic time history characteristics and the mechanical properties under the vertical static load; Analyzed the different under different seismic fortification intensity, the structure of the base shear and displacement and its changing law of the inter-layer displacement angle and so on; Analysis of upper arrangement of different forms of shear wall transfer beam corresponding dynamic characteristics and seismic response and the structure of the mechanical properties under the vertical static load;Analysis of the eccentric wall effect on the performance of transfer beam stress; Analysis of influence on its mechanical properties of transfer beam under two cases of changing of the concrete strength grade and cross-section area.Analysis result show that the when fortification intensity of the structure is 6 degrees, the results of indicators of the elastic time history analysis under different seismic wave are less than the modal analysis and the result of the vibration mode decomposition response spectrum method;when the fortification intensity is 7 degree and 8 degree, base shear did not meet the requirements of structural design,which must be in structural seismic design again and need to use the elastic time history method to calculate completely under severe earthquake, and the code for seismic design of buildings in the relevant contents stipulated in the match. Whenchanging the form of the shear wall upper transfer beam, arch effect exist between the beam and upper wall. Along the beam shear wall is with the arrangement, although one direction stiffness contribution is large, but the greater the stiffness of the earthquake under the action of horizontal force is, the bigger the and axial force of the transfer beam is. Therefore, in terms of safety, applicable, economic, practical engineering can open hole in the upper shear wall, but the mouth of the cave should not be too large, and the wall should be symmetrically arranged along the beam span direction. When the upper shear wall along the beam axis eccentric layout,there will be more influence on the internal forces of the wall,which lead to obvious deformation of transfer beam in a horizontal direction and is not conducive to structure safety.Transfer beam's own concrete strength grade and the change of cross section area has a little influence on the mechanical properties of its own.This paper mainly research on mechanical properties of a beam transformation layer structure.The results obtained in engineering provides the theoretical basis and reference value in practical application.