| Lateral resistance system adoption plays an important role in the design of structure,especially for high-rise buildings. The composite steel plate shear wall has been proven to bean effective component for resisting lateral force and dissipating seismic energy. Compared tothe traditional RC shear wall, the composite steel plate shear wall possess excellent ductility,high bearing capacity, little degradation of lateral stiffness and stable energy dissipationperformance at later load bearing period. Besides, this composite wall overcomes fivedisadvantages of unstiffened thin steel plate shear wall when using post-buckling strength,such as severe out-plane buckling, poor fireproof performance, unstability hysteric energydissipation capacity and unfavorable to the stability of side columns.A large number of significant achievements on composite steel plate shear wall havebeen obtained at home and abroad. However, most of the achievments just focused on thewallboards, while the performances of composite steel plate shear walls withmoment-resisting steel frame were rarely involved in. Moreover, researches about compositesteel plate shear wall were confined to the static analysis, and has not involved dynamiccharacteristics. So systematic studies on the above two aspects need to be conductedimmediately.As a new type of composite lateral resistance system, the steel frame-composite steelplate shear wall (SCSW) structure increases the lateral stiffness of traditional momentresistant steel frame, so that provides the possibillity to use partially-restrained (PR)connections which has a low rotational stiffness. The hysteretic behavior, load transmissionmechanism and deformation modes of the SCSW struture system with PR connections isdifferent from fully-restrained connection SCSW system. And, for the complexity anddiversity of questions involved, the study on PR connection SCSW structure system is still invacuum at present. The FEM analysis of SCSW was conducted in this paper, which providessufficient theoretical foundation for the related experiments of the project “study on dynamiccharacteristics and seismic behavior of the composite new type lateral resistance system-steelframe structure system” which is sponsored by NSFC.The interaction between steel plate and RC boards was solved by the contact algorithm, and the computed results were also verified. In order to analyse the lateral resistance behavior,hysteretic behavior, working mechanisms and interaction between composite steel plate shearwalls and adjacent columns of SCSW structure system, two models of two-story one baySCSW and STSW (steel frame-thin steel plate shear wall) structure systems and with thesame PR connections under static load were established separately by ANSYS. The computedresults indicated that the ultimate bearing capacity and elastic lateral stiffness of PRconnection SCSW will increase by33.6and42.6percent separately compared to that ofSTSW, and the hysteric energy dissipation capacity can be more steady. Compared to thetension field mechanism of common steel plate shear wall, the stress response of thecomposite steel plate shear wall approximates in a plane stress state, which can increase theutilization rate of steel plate substantially. Both of the two types of steel plate shear walls canobtain great ductility performance, and the ductility coefficient is all above five.Base on the “BASE” model, the FEM parameter analysis of6series and15finiteelement models were performed, in which, the six main influence factors, such as initialrotational stiffness of connections, configuration pattern of bolts, deepth to thickness ratio ofthe infill steel plate, numbers of the concrete coverplates, thickness of the concretecoverplates and connection strength between the infill wall and the steel frame were takeninto consideration. Finally many practical conclusions were obtained and the aseismic designrecommendations were brought forward.The dynamic characteristics analysis of six-story one bay large dimension SCSW modelwas conducted adopting the eigenvalue solving methods of modal theory. The simplifiedcalculation of dynamic characteristics which demonstrated by corresponding experiment wasproposed in this paper. In order to discuss the dynamic characteristics of SCSW structuresystem, the natural vibration period (frequency) under the first three order vibration mode ofSCSW and the traditional steel frame was calculated separately. The results show that thenatural vibration period of SCSW system is no longer available for the empirical equationproposed in “Building Code of Aseismic designing”, and for SCSW, this empirical equationneed to be reduced. On the basis of “BASE” model for dynamic analysis, the FEM parameteranalysis were performed, in which the four main influence factors, such as initial rotationalstiffness of connections, numbers of stories, thickness of the the infill steel plate and quality of the coverplates were taken into consideration, and Finally many practical conclusions wereobtained.The application of the SCSW structural system with PR connection is very wide. Thestatic and dynamic analysis of the composite SCSW system in this paper can be useful forcomplementing the studies of the composite steel plate shear wall at present, guidingengineering design and making bases for future research. |
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