Study On Mechanical Properties Of Steel-Concrete Hybrid Structures Based On Base Isolation

As an earthquake-prone country,China suffers from huge casualties and property losses in the earthquake.The traditional countermeasures on improving house anti-seismic capability is to increase the structure of the reinforcement and consume the seismic energy through structural self-damage,which will cause a cost increase,and greater losses.With the rapid development of China's economy,people's living standards are rising steadily.Confronted with the increasingly scarce land resources,China copes it with high-rise residential buildings.Meanwhile,the structure is developed towards diversification,among which,steel-concrete mixed building structure serves as a mainstream the mainstream.In such context,the use of traditional seismic design will lead to greater losses once earthquake strikes.In recent years,scholars put forward theories of isolation system and made a lot of research,but research upon steel-concrete mixed building structure is still limited in the stage of seismic resistance study,with little on isolation and its related experiment.Therefore,it is of great theoretical and social significance to apply the base isolation technology to the steel-concrete mixed building structure and study its seismic isolation effect under earthquake action.In this paper,a steel-concrete mixed structure model is designed and fabricated,and the lead-bearing rubber isolation bearing is applied to this structure,and shaking table test and finite element analysis are carried out on the model.The main research contents are as follows:(1)The current research situation on basic isolation technology and steel-concrete mixed building structure are analyzed,and the mechanical properties of lead-isolated bearing studied.(2)The single particle calculation model,the double particle calculation model and the multi-particle calculation model of the base isolation are established,and the related dynamic differential equation is deduced.steel-concrete mixed building structure is established,and the time history analysis is carried out and compared with the experimental structure.(3)After designing and making a steel-concrete mixed building structure model,shaking table simulated earthquake test is made on the ordinary seismic structures and the base isolation structures respectively.The seismic response of the two structures is measured by two kinds of natural waves,one kind of artificial wave and two kinds of acceleration.According to the experimental data,the acceleration response,the displacement response and the maximum shear response of the two structures are compared and analyzed.The theoretical results of the column shear force are compared with the experimental results by the double particle calculation model.(4)Through the finite element software SAP2000,the numerical analysis model of steel-concrete mixed building structure is established,and the time history analysis is carried out and compared with the experimental structure.