| Steel reinforced concrete structure is featured by high strength,high stiffness and good ductility,it is suitable for high-rise and super high-rise buildings with heavy load requirements and high requirements for storey height.The traditional construction method of steel reinforced concrete structure involves complex process and long construction duration.To improve the construction performance of steel reinforced concrete structure,the fully prefabricated steel reinforced concrete column and column-column joints was proposed by the research group,the column-column joints realized connection of node structure at the end of the columns via high strength bolt,which could improve the construction efficiency while insuring the structure seismic performance,and it has a wide application prospect as a consequence.In this paper,a systematic research was conducted toward the seismic performance of fully prefabricated steel reinforced concrete column and column-column joints,and the main research results were as follows:(1)The overseas and domestic research status of steel reinforced concrete structure and assembled steel reinforced concrete structure was summarized,and a form of fully prefabricated steel reinforced concrete column and column-column joints was put forward on the basis of the current researches.(2)The specimens in the literature were selected for nonlinear finite fem simulative analysis,and the hysteretic curve,skeleton curve and failure mode of the test specimens and the simulation model were compared to verify the rationality of the modeling method and the accuracy of the simulation analysis results,thus to lay a foundation for the subsequent establishment of prefabricated column model and column-column joints.(3)With regard to fully prefabricated steel reinforced concrete column,18 column specimen models were built with steel content,axial compression ratio,shear-span ratio,volumetric stirrup ratio and stirrup form as variables,to explore the influence rules of various parameters on failure mode,bearing capacity,stiffness degradation,ductility,energy dissipation capacity and other aspects of specimens under horizontal reciprocating load.According to the research results,it showed that fully prefabricated steel reinforced concrete column is of high bearing capacity,good ductility and energy dissipation capacity.The horizontal bearing capacity of specimens can be significantly improved by increasing steel content.The ductility and energy dissipation capacity of specimens can be greatly improved by increasing shear span ratio.When the shear span ratio was 3.75,the horizontal bearing capacity of specimens might increase more with the increase of volume stirrup ratio.Improving the axial compression ratio will accelerate the strength attenuation of specimens in the failure stage.Beyond that,the ductility of the specimen with bolt stirrup is better than that with common double-limb stirrup.(4)In terms of nodes between fully prefabricated steel reinforced concrete columns,axial compression ratio,shear span ratio,steel content ratio and concrete strength were utilized as variables to establish 17 node specimen models between columns,and carry out nonlinear finite element analysis.The research result suggested that the node connection between columns is reliable,high in strength,and with good seismic performance;when increasing the axial compression ration,the strength reduction of node specimen may accelerate with reduce in ductility;while in the event of increasing the shear span ratio,the energy dissipation capability at the mode will be significantly improved;in case of increase of steel content,the horizontal bearing capability of the specimen will be greatly enhanced;and when improving the concrete strength,the specimen will be improved in its bearing capability,while the strength reduction may speed up.(5)After referring to the pseudo-static test of a section in this paper,the model was provided with simulation recovery,and fully prefabricated steel reinforced concrete column and column-column joints were applied in the section frame model,to analyze the failure mode,hysteresis curve and skeleton curve.The research results showed that the seismic performance of the assembled frame and the cast-in-place frame is similar,and both of them have analogous failure mode,that is,the plastic hinge is formed at the beam end first.(6)The resilience model toward fully prefabricated steel reinforced concrete column-column joints,was put forward,and simulative specimens were selected for verification.The results indicated that the resilience model proposed in this paper can accurately reflect the actual energy dissipation capacity of components and the influence of each parameter,which can provide theoretical support in elastic-plastic second order analysis. |
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