| With the development of construction industry in China, the shear wall structurewhich is supported by a large space frame structure at the bottom is gradually becoming apopular architectural form of high-rise building. In order to meet the requirements ofdifferent using function of buildings, a frame structure that normally can provide larger aspace where can be used as a shopping mall or a playground etc. is needed to be set at thebottom of the building, at the meanwhile, shear wall system which normally providesrelative smaller width of a space will be set as the upper part of the building, used as office,hotel etc. However, when the transfer story is set above5floor (seven-degree district),above3floor (eight-degree district), the vertical stiffness of the structure may seriousirregular which may strong above the transfer story and soft below it, result in extremelycomplicated transmission route of force, then it should be defined as a complicatedstructure based on the structural code. Traditional anti-seismic methods cannot ensure thesafety and the reliability of this kind of unusual structure. During an earthquake, largedisplacement and deformation usually occur on the relative softer frame structure where isbelow the transfer story, leading to a damage or even collapse. Combining with thedevelopment of the theory and the design technology of energy-dissipation structuralsystem, such kind of special anti-seismic structural system has gradually earningengineers’ attention. In this research, the viscous damper has been arranged on the frame-supported story to form an energy-dissipation structural system with a high-level transferstory. Anti-seismic performance has been analyzed in this paper, the main contents include:(1) The systematic description of the structure and the mechanical model of theviscous damper have been provided by analyzing the existing energy-dissipated theory andtechnology.(2) The energy-dissipated performance of the structural system with a high-leveltransfer story has been researched, including analytical methods of the energy-dissipatedstructure, energy-dissipated design and analytical methods of structure with a high-leveltransfer floor, and analytical methods of energy-dissipated structure under the dynamicload such as a fast nonlinear analysis (FNA) method have been detailed as well.(3) Combining with an engineering example, a frame-supported shear wall structurewith a high-level transfer story model and an energy-dissipation structure with viscous-damper devices model have been established by SAP2000structural analysis software. Firstly, modal analysis method has been used to comparatively analyze the vibrationcharacteristics of those two three-dimensional models. Then, the TAFT wave, TangshanBo and Lanzhou wave have been inputted, by using time-history analysis method, thestructure performance analysis of those two models under the frequently occurred andrarely occurred earthquake have been processed, respectively. At last, the advantages anddisadvantages of the energy-dissipated structure have been quantitatively analyzed bycomparing the story drift angle, acceleration, layer shear and viscous dampers hystereticbehavior of the structure under seismic action.(4) By using different arrangement form of damper, the anti-seismic performance oftransfer beams and structure have been compared.(5)A comparative analysis of the direct costs and the post-earthquake repair indirecteconomic benefits for energy-dissipated structure and anti-seismic structure has been made,respectively.In this research, theoretical analysis and software simulation studies have all indicatedthat the viscous damper arranged in structure with a high-level transfer story caneffectively absorb the seismic energy and reduce the seismic response of the wholestructure. The analytical results in this paper can provide certain reference value for theapplications of energy-dissipated technology in practical engineering. |
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