Analysis Of Seismic Performance Of Frame-core Buildings Using Combined Seismic Damping And Isolation Technology

As the most serious disaster affecting human society among the four major disasters,earthquakes often lead to the damage and collapse of buildings,causing great threats to people’s lives and property safety,so seismic research on building structures is particularly necessary.Seismic damping and isolation technology is an effective method to improve the seismic performance of structures.At present,the application of seismic damping and isolation technology in China is dominated by the separate use of seismic damping technology or isolation technology,and the combination of seismic damping and isolation technology is still under development.In response to the above problems,this paper takes a high-rise building in Puyang,Henan Province as the engineering background and establishes the base seismic isolation and layer interval seismic structure based on the Seismic Isolation Design Standard for Buildings.According to the different combinations of seismic damping and seismic isolation structures,dampers are set in the layer and superstructure of the base seismic isolation layer,and in the layer,superstructure and substructure of the layer seismic isolation layer,respectively,to form different combined seismic damping and isolation schemes.Through modal analysis and dynamic time analysis under fortified,rare and very rare seismic intensities,the effects of seismic isolation structures and combined damping and isolation structures on seismic performance and the differences in seismic damping effects between different damping and isolation structures are studied in comparison,with the following main conclusions:(1)Compared with the uncontrolled structure,the existence of the seismic isolation layer can greatly extend the self-vibration period of the structure,but the different positions of the isolation layer affect the amplitude of the self-vibration period of the structure.Compared with the foundation seismic isolation structure,the self-resonance period of the layer isolation structure is longer,the shock absorption effect of the structure is better,and the self-resonance period of the additional viscous damper structure is small,but it can effectively reduce the dynamic response of the structure under the action of earthquake.(2)A comparison of the time analysis of the uncontrolled structure,the base isolation structure,the structure with dampers in the base isolation layer and the combined structure with dampers in the upper part of the base isolation layer shows that both the base isolation structure and the combined structure can reduce the inter-storey displacement angle,the floor shear force and the vertex acceleration of the structure;the damping effect of the structure with dampers in the upper part of the base isolation layer is better than that of the base isolation structure and the damping effect is stable;the damping effect of the structure with dampers in the base isolation layer is unstable and the damping effect is poor when the seismic intensity is small,but improves with the increase of the seismic intensity.(3)A comparison of the dynamic time analysis of the uncontrolled structure,the interstory seismic structure and the combined seismic isolation structure with dampers in the interstory,upper and lower layers shows that both the interstory seismic and combined seismic isolation structures have a significant effect on reducing the structural response under seismic action,and the interstory displacement angle,floor shear force and vertex acceleration of the structure are significantly reduced.The damping rate of the combined seismic isolation structure with dampers in the interstory is much higher.(4)Comparing the combined structure with dampers in the upper part of the base isolation and the combined structure with dampers in the interstory seismic layer,the damping effect of the two structures is similar from the point of view of seismic performance.In terms of economy,the structure with dampers in the interlayer seismic layer requires fewer dampers and vibration isolation bearings,consumes less material for the damping and isolation devices,and is less difficult to construct in engineering applications,so it is more applicable in practical engineering.