| At present,China’s construction industry has been using the traditional method of cast-in-place and artificial masonry,and the traditional construction work production efficiency is low,the construction site produces dust,noise and other great impact on the environment.In order to realize "green,environmental protection,energy-saving building" and realize the full utilization and development of resources,the state vigorously develops the prefabricated building,because the prefabricated building is the direction of the industrialization of building development,is an effective way to realize the green,environmental protection,energy-saving building.Due to the particularity of the prefabricated building construction,there are many problems in the development of the prefabricated building,such as the way of structure splitting,the joint structure,the seismic performance of the structure and so on.In this paper,through the analysis of the characteristics of the prefabricated building in the earthquake disaster area,as well as the characteristics of the prefabricated building split method and stress,and combined with the domestic and foreign research on the beam-column joint connection,the seismic performance of the two different joints of the grouting sleeve connection and u-shaped steel bar connection studied in this paper is determined.In this paper,a two-span three-story structure is taken as the research object,and the fully assembled frame structure model with grouting sleeve connection and u-shaped steel connection and the cast-in-place frame structure model are respectively established under the action of cyclic reciprocating load,and the seismic performance of the three different models is compared and analyzed.Through comparative analysis of three kinds of model of the frame structure of the deformation and stress of the concrete and reinforcing steel bar and concrete tensile damage can be concluded that the three kinds of simulation of structure deformation is roughly similar,have occurred in the beam end,beam-column core column and the underlying roots,and the maximum stress of concrete and reinforcing steel bar and concrete tensile damage also occurred in here;By analyzing the hysteretic loop curve,skeleton curve,ductility coefficient,stiffness degradation,energy dissipation performance and other main research contents of the structure model,it can be concluded that the assembled structure constructed with two kinds of different joints is lower than the cast-in-situ frame structure in terms of ductility,initial stiffness,energy dissipation performance and other aspects.In order to further analyze the seismic performance of the prefabricated building structure,the seismic performance of the structure is analyzed by changing the axial compression ratio of the structure and the strength grade of the post-poured concrete.By analyzing the hysteretic loop curve and skeleton curve of the structural model under different axial compression ratios,it can be concluded that the increasing axial compression ratio has little influence on the structure’s energy dissipation capacity and plastic deformation capacity,but significantly improves the bearing capacity and stiffness of the structure.However,changing the strength grade of concrete has little effect on the energy dissipation,plastic deformation,ductility and other seismic performance of the structure. |
