| The development of prefabricated buildings is one of the effective approach to realizing the objectiveof energy saving and emission reduction in the architecture field and architectural industrialization ofChina. The prefabricate assembly is the greatest advantage of steel structure, steel frame among which iswidely used. Because of the smaller lateral stiffness of steel frame, an important method to improve thelateral stiffness is adding the infilled wall in steel frame. However, there are several shortcomings of thecomplicated constructed method, inconvenient prefabricate assembly and higher maintenance cost oftraditional lateral resistance wall.A new type of fabricated structural system with steel frame-prefabricated concrete lateral resistancewall (SPW system) is adopted to realize the prefabricate assembly, reduce the vertical load of lateralresistance wall, insure the traversing of slab reinforcement and set windows and doors hole. Themechanical behavior and computational theory of this fabricated structure are systematically studied byexperimental research and theoretical analysis. The main contents and conclusions are listed as following:Development of new SPW system and experimental study on full scale specimensFour full scale specimens composed of steel frame and steel reinforced concrete or reinforcedconcrete lateral resistance wall are designed and tested with cyclic horizontal load. The failure mode,carrying capacity, rigidity degeneration, hysteretic characteristics, ductility and dissipation capacity of thestructural system are systematically analyzed by cyclic horizontal load, the destruction mechanism oflateral resistance wall, force transferring path and internal force distribution relationship are studied.Based on the experimental research, seismic performance levels and quantitative index of SPWsystem are analyzed, the failure order and failure modes are investigated. Failure criteria and lateral anglelimitation for the five performance levels are suggested.Analysis on effect factors of mechanical behavior for the SPW system1. The mechanical behaviors of joint interface between wall and steel beam are studied by the micronumerical model. the distribution relationships of shear force and bending moment among shear stud,anchor bar and cnnection steel are qalitativelynd quantitatively analyzed. The improvement approaches ofconnection type are put forward, which can ensure the reliability of connection between lateral resistancewall and steel beam.2. The influence factors and influence law of the rigidity of frame column and beam, the height to width ratio and steel content of edge member for lateral resistance wall on cooperative performance for theSPW system are studied through the perspective of elastic stiffness, carrying capacity, hysteretic curve, thedistribution relationships of shear force and bending moment, the plastic development process anddissipation capacity.Establishment of computational theory for the SPW system1. The calculational model of inter-story elastic drift stiffness is presented by analysis of the stiffnesscontribution for structural system, the computational formulas of lateral stiffness considering beamconstrained effect for lateral resistance wall and steel frame are established and the rationality is verifiedby test data. The beam-column simplified model with cross bars and vertical bars for lateral resistance wallis proposed and the generation relationships of stiffness are established, by which the internal force anddisplacement can be conveniently calculated.2. The differential equations for the cooperative working performance among steel frame, restrainedbeam and lateral resistance wall are established by continuous method, stiffness parameter λ of structuralsystem is put forwards. Three sets of the calculation formulas for the lateral displacement and inner forceare obtained by solving the equations.3. The analysis models and calculation diagrams for shear bearing capacity under the differentdamage states are presented based on failure mode of structural system and the rationality is verified bytest data.Optimum design method and design suggestion of reasonable stiffness for new SPW system1. The optimized mathematical model with base shear force as objective function and the largestinter-storey drift angle as constraint conditions is put forward based on the theory of response spectrum,the optimization programs are writed in high-level language by MATLAB, reasonable stiffness of steelframe, restrained beam and lateral resistance wall along with influence factors of parameter λ are analyzed,design tables of the relationship among characteristic period Tg, the ratio of rigidity-to-gravity η andoptimum value of parameter λ under different seismic fortification intensity are presented, which can beused for reference to designers.2. Ninety analytical models with same lateral stiffness and different stiffness ratio among steel frame,restrained beam and lateral resistance wall are designed. The method of elastic-plastic time history analysisis adopted based on the control of elastic-plastic storey displacement, the change laws between parameter λand elastic-plastic storey displacement are obtained by statistical approach, the results show the ratio of frame stiffness CF-restrained beam stiffness CBhas little effect on lateral inter-storey displacement peak asconstant parameter λ value; when parameter λ is between2and3, the lateral inter-storey displacement peakhas the minimum point, and the design suggestion on optimal value for parameter λ is put forward.Generall, it is porved that the new type of fabricated mixed structural system (SPW system) withsteel frame-prefabricated concrete lateral resistance wall is feasible and reasonable, the research resultsprovide the test basis and theoretical guidance for real projects. Finally, some issues that need furtherinvestigations are discussed. |
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