Seismic Performance Researches On Structures Of High-rise Building With Transfer Slabs In Fissure Ground

The non-uniform ground subsidence caused by non-seismic ground fissures poses great harm to all kinds of building structures.In practical applications,the existing rules on the impact of ground fissures mainly take avoidance method in space as measures.In other words,according to the structural styles of buildings,safety level,location(upper and lower disk),a minimum avoidance distance can be set.As one of the important forms of high-rise building transfer structure,transfer story with thick floorslab has the advantage of flexible layout,and no need to align with the superstructure.However,the conversion of thick plate with a considerable mass and stiffness make the structure have mutation on stiffness in the vertical direction,and become much easier to form a weak layer,which is unfavorable to earthquke.Based on the existing researches,this paper studies the seismic performance of the shear walls structures with supporting frames to demonstrate the feasibility of the high-level conversion in the ground of the 7-degree seismic fortification area,and on this basis,to demonstrate the feasibility possibility of shortening the minimum avoidance distance in the affected area of ground fissures,so as to provide reference for practical engineering applications.The main tasks of this paper are as follows:(1)Taking the original design of Luoyang Hongye Plaza high-rise residential building in the 6-degree seismic fortification area as an example,re-establish analytical model of the common site(avoidance distance is not less than minimum value)in the 7-degree seismic fortification area and use finite element software to make modal analysis,the response spectrum analysis,the elastic dynamic time-history analysis,the static elasto-plastic analysis and other related work.(2)In order to study the influence of the position of the plate-type conversion layer on the seismic performance of the structure,the conversion plate was set on the second,fourth and sixth layers respectively.The three models were made comparative analysis from views of the vibration period,interlayer displacement,interlayer displacement angle,internal force change and so on.(3)Taking the high-rise residence of Hongye Plaza as an example,the change of the inter-layer displacement,the inter-layer displacement angle and the internal force with the decrease of avoidance distance are studied in the rupture site(avoidance distance less than the minimum avoidance distance)in the 7 degree seismic fortification zone.And the interlayer displacement,the inter-layer displacement angle and the internal force of the common site(only consider the role of the earthquake)are compared and analyzed with above,and on this basis the most reasonable avoidance distance is obtained.Through the research,it is found that:(1)according to the specific research and analysis of the high-rise residential building in Hongye Plaza,the seismic performance index of the common site in the 7-degree seismic fortification zone still meets the specification requirements;(2)the results show that the internal force,the vibration period of the structure,the interlayer displacement,and the interlayer displacement angle of the structure change with the increase of the position of the transition layer,showing some of regularity.And it is proved that the high-level conversion is feasible in the 7 degree seismic fortification area,but the weak layer should be moderately strengthened;(3)the influence of uneven settlement on the seismic performance of the structure is more significant,and more attention should be paid to the practical applications.Reasonable avoidance distance remains to be further studied.