Study On Seismic Isolation Performance Of Frame Structure And Analysis Of Engineering Examples

Isolation,as the name implies,is to set the isolation layer to make the whole structure natural vibration period longer,increase the damping,reduce the seismic energy upward structure transmission,so as to ensure the safety of their own structure,to achieve the expected seismic purpose.From the traditional seismic structure to the foundation isolation structure,from the foundation isolation structure to the layer spacing earthquake structure,there is no doubt that the rapid development of isolation technology,after 40 or 50 years of development and accumulation,isolation technology has reached a new height.In particular,the interval seismic technology,because of its advantages over other forms of seismic structure is obvious,such as: good seismic effect,low cost,etc.,is favored by researchers.Of course,this is only one of the building structure damping control,we know that the damping control of engineering structures usually includes passive control,active control,semi-active control and hybrid control,and they can be further subdivided,so there is still a lot of research on isolation structure that we need to in-depth study and mining.In combined with the practical engineering case,this paper use a 10 layer of large finite element software SAP2000 chassis double tower frame structure,respectively set up the isolation layer structure,base isolation structure,space structure and the layer spacing combining approximate TMD system structure model,and then after the modal analysis of the four kinds of structure model,the dynamic response spectrum analysis and time history analysis,comparing the results of the analysis of four kinds of structure on the seismic response is obtained from time to tome what change rule and the damping performance and effect of each have a rough evaluation.Through analysis and comparison,the results in modal analysis show that the vibration period is extended to a certain extent,no matter the base isolation,the layer separation,or the layer separation combined with the similar TMD system.In response spectrum analysis results show that under the effect of three different in seismic wave,the base isolation structure and layer structure,between their interlayer displacement than traditional anti-seismic structure displacement between layers is reduced a lot,show that vibration isolation structure with vibration isolation device relative to the structure,the structure damping effect is better;The result of time history analysis shows that compared with the peak of peak acceleration of the structure,the interval seismic structure is about1/3~4/5 of the traditional seismic structure,which indicates that the damping effect of the interval seismic structure is much better than that of the traditional seismic structure.In terms of seismic sensation and structural safety,the interval seismic structure also shows great advantages.