Seismic Performance Analysis Of Fabricated Composite Frame Structure

The development of green innovation has become a national strategy.In the face of the increasing temperature of assembled buildings,the fabricated composite frame structure as an important part of the assembled structure,the study of its seismic performance is very necessary.The assembled composite frame structure combines the advantages of prefabricated and cast-in-place structures and realizes the requirements of industrial production and green environmental protection.In this paper,according to the stress characteristics of the assembled frame structure,the split and assembly scheme is put forward,and then its seismic performance is studied.The specific work is as follows:(1)This paper summarizes the methods of beam-column joint connection of assembled concrete structure at home and abroad,and puts forward the component splitting and connection scheme of a new type of assembled composite frame structure.That is to say,the lower steel bar is added at the bottom of the beam-column joint,the precast composite beam section adopts the form of inclined section,and the concrete is poured in the core area of the beam-column joint.The seismic performance of the composite frame structure is compared with that of the ordinary assembled composite frame structure and the whole cast-in-place frame structure.(2)Three kinds of frame structure models with different connections are established by using ABAQUS finite element analysis software for quasi-static analysis.Under the action of low cycle reciprocating load,the deformation and stress distribution,hysteretic curve,skeleton curve,ductility,stiffness degradation,energy dissipation performance and frame failure characteristics of three kinds of structures are taken as the main research contents.The seismic performance of assembled composite frame structure is comprehensively analyzed.The results show that the ductility coefficients of cast-in-place frame structure,new assembled composite frame structure and common assembled composite frame structure are 3.65,3.41 and 3.33 respectively,which meet the requirements of seismic design.The bearing capacity,initial stiffness and energy dissipation of the new fabricated composite frame structure are lower than those of the cast-in-place frame structure.The bearing capacity,initial stiffness and energy dissipation capacity of the new fabricated composite frame structure are better than those of the ordinary assembled composite frame structure.(3)The dynamic time history analysis of the assembled composite frame structure is carried out,and two different seismic waves,Lanzhou wave and EL-Centro wave,are input to analyze the dynamic response of the structure under the action of frequent earthquakes.According to the natural frequency and period of the structure,the time history curve of the top floor displacement,the maximum displacement of each floor,the interstory displacement and the interstory displacement angle,the comparison and analysis are carried out with the cast-in-place frame structure.It is concluded that under the action of EL-Centro wave,the maximum displacement of the top floor of cast-in-place frame structure,new assembled superimposed frame structure and common assembled superimposed frame structure are 2.884mm,4.366mm,4.547mm respectively.The maximum displacement of the top floor of cast-in-place frame structure,new assembled superimposed frame structure and common assembled superimposed frame structure are 2.704mm,3.817mm,4.185mm respectively.The displacement of the common assembled composite frame structure is the largest,that of the new assembled composite frame structure is the second,and that of the cast-in-place frame structure is the smallest.The interstory displacement angle of fabricated composite frame structure is less than the limit value of elastic interstory displacement of reinforced concrete frame structure in seismic code is 1≤550,which meets the requirements of seismic code and can be used in seismic fortification area.