Analysis Of Mechanical Feature And Seismic Design Method Of RCS Hybrid Frame Structure With Replaceable Components

Resilience has been a new tendency of engineering earthquake resistance.The structures with replaceable components could perform well after earthquake event and RCS frame structures integrated the advantages of the reinforced concrete and steel.Based on the two structures,a novel RCS hybrid frame structure with replaceable components was put forward,and there are no relevant researches on it.In this paper,the mechanical feature and design method were studied through the numerical analysis.The structural system proposed in this paper was systematically expounded from three aspects:structural composition,seismic working principle and expected stress state.Based on a RCS composite frame,the RCS hybrid frame structure with replaceable components was designed and numerically simulated.The mechanical characteristics of the structure were analyzed from the aspects of failure process,bearing capacity,stiffness and deformation.It showed that the proposed structure could achieve the expected stress state.The failure progress,bearing capacity,stiffness and deformation,etc.were studied to clarify the mechanical characteristics of the proposed structure.Seventeen structures,designed by controlling the single variable method,were analyzed to study the influence of various parameters on the structural force characteristics.The parameters included failure mode,the section form,the interlayer display of the replaceable beam and the span and position of the energy dissipation frame.By analyzing how the structure implements damage control,the control parameters of the elastic design are selected as K_DF/K_MF and V_DF/V_MF,which respectively represent.the elastic stiffness ratio and the elastic shear ratio of the energy dissipation frame and the main frame Aiming at obtaining design control parameters,the cooperative working principle of energy dissipation frame and main frame was assumed,which was based on the cooperative principle of double anti-lateral force structure system..In this paper,eight RCS hybrid frame structures with replaceable components were designed to meet specific performance objectives.The dynamic elastoplastic time history analysis and static nonlinear analysis were used to determine the range of design control parameters under the corresponding performance targets,and K_DF/K_MF was1.3⁴.3 and V_DF/V_MF was 1.5⁴.Taking the inter-layer displacement angle as the performance index,the inter-layer displacement angle limits under different performance levels were established by collating the time-history analysis results of the above eight structures that meet the specific performance objectives.Since the seismic concept of the RCS hybrid frame structure with replaceable components was different from the common RCS frame structure,the control parameters K_DF/K_MF and V_DF/V_MF were proposed as the elastic design basis,and the interlayer displacement angle and plastic hinge state are taken as elastoplasticity design performance control indicators for performance seismic design methods.According to the force characteristics of different components,the corresponding calculation model is established,and the section design method of each component is derived.In order to simplify the iterative design process of controlling the structural elasticity interlayer displacement angle,the influence of different components on the lateral displacement of the structure was analyzed,and the key components controlling the lateral displacement were determined.Based on the proposed design method,the effectiveness of the proposed design method is illustrated by an example.