Seismic Analysis Of A Super High-rise Building Utilizing Hybrid System With Seismic Isolation And Energy Dissipation Technique

With the development of national economy,there are more and more super high-rise buildings in our country,and super high-rise buildings in high fortification intensity area is also increasing,so the aseismic design of super high-rise buildings becomes particularly important.In the field of earthquake resistance of structures,the commonly used anti-seismic design include traditional seismic methods,seismic isolation or energy dissipation methods,hybrid system with seismic isolation and energy dissipation methods.At present,great progress has been made in the design of structural seismic isolation and energy dissipation,and corresponding design standards have been established,while the mixed application technology of shock absorption and isolation is still under development.Based on the design of a proposed super high rise building,this paper discusses the possibility of applying the hybrid system with seismic isolation and energy dissipation in practical engineering.This paper mainly does the following work:(1)Using YJK software,the structural analysis models of three schemes are established:scheme 1-traditional seismic structure,scheme 2-the base isolated structure,scheme3-utilizing hybrid system structure with seismic isolation and energy dissipation technique.The modal analysis of the structure of the three schemes is carried out to analyze the seismic resistance of the three schemes.(2)The response spectrum analysis,elastic time history analysis under moderate earthquake and large earthquake were carried out for the three schemes.By comparing the interlayer shear force and interlayer displacement of three kinds of structures under earthquake action,the influence of the hybrid system with seismic isolation and energy dissipation of structure is analyzed,and compared with the base isolation technology.(3)According to the domestic standard,the detailed structural design of the three schemes,and compared the characteristics of the three schemes after the detailed design,analysis of the economy of the three structures.The advantages of the mixed application technology of seismic isolation and energy dissipation and the possibility of its application in practical engineering are discussed.The main conclusions are as follows:(1)In the case of small earthquakes,compared with Scheme 1,the damping effect of Scheme 2 and Scheme 3 is basically the same,and the interlayer displacement is reduced by10%～30%.Under moderate earthquake action,the damping effect of scheme 3 is more obvious,and the interlayer displacement decreases by 45～75%.When the structure is subjected to a large earthquake,the damping effect of scheme 3 is better for the 1～10 layers of the structure.Because of the different arrangement of isolation bearings,the damping effect of scheme 2 is better for the structure above the isolation layer,but the damping effect of scheme 3 is still good.hybrid system structure with seismic isolation and energy dissipation technique can effectively improve the seismic resistance of structures.(2)In the elastic time-history analysis of large earthquakes,the response of the structure in scheme 3 to seismic waves exceeds the standard limit,which results in the failure of the seismic isolation bearing of the floor.However,the overall structural deformation is still within the standard limit because the energy dissipation shock absorber is still effective.The hybrid system with seismic isolation and energy dissipation technique provides two safety lines for the structure and increases the safety of the structure.(3)Adopts hybrid system with seismic isolation and energy dissipation technique design,the structure of concrete and steel consumption has been significantly reduced,improve the economic efficiency of the structure,so the application of the damping and isolation mixed application technology in practical engineering is feasible.