Analysis On Effectiveness Of Seismic Protection Of Secondary System Using Base Isolation And Inter-story Isolation

With the rapid development of urbanization in China,infrastructure construction has been greatly improved and improved;with the development of the world network,more and more precision instruments and equipment need to be placed in the ground construction,especially the lifeline of the project Ancillary facilities,but also related to the earthquake after the operation of the city to maintain the basic survival needs of people.All of these secondary structures are urgent need for seismic function.The main earthquake-isolated structure can significantly reduce the earthquake effect and effectively protect the secondary structure.In view of this,this paper takes the six-story steel frame model as the research object,and makes the following comparative study on the seismic performance of the secondary structure in non-isolated structures,base-isolated structures and different story-isolation structures:The applicable scope and advantages of story isolation are analyzed.Compared with the most widely used base isolation technology,according to the diversity of construction sites and structure types,it is concluded that vertical irregular buildings or buildings with a special geographic location,it is inappropriate to set isolation bearings in the foundation.Also,during the strengthening of existing buildings,it is extremely favourable to promote earthquake-isolation technology by breaking the isolation layer location constraints and moving up the isolation layer position to the middle of the structure.The basic characteristics of lead rubber bearings and the factors affecting the performance of support isolation were studied.Through the research on the energy dissipation and damping mechanism of different isolation bearings,the advantages and disadvantages of each type of bearing were analyzed.Due to the mature,convenient,cost-effective and easy replacement of the lead rubber bearings,Therefore,it is used to study the isolation.By comparing the non-isolated structure and the earthquake-isolated structure,the lead-rubber isolation bearing has a good function of energy dissipation and excellent seismic effect.The seismic effect of secondary structure with different earthquake isolation type is compared.The displacement,acceleration,and interlaminar shear of the secondary structure under earthquake effect are obtained.The results of the isolation layer in different locations show,Through the study of the isolation layer in different locations show that,when the isolation layer is at the bottom and the top of the structure,the secondary structure has the best isolation effect,and the isolation effect of the middle part isoaltion is the smallest.With the increase of the isolation layer,the isolation effect of the secondary structure is firstly enhanced and then reduced and lastly enhanced.But the isolation effect of secondary system no matter which the isolation layer is located in the structure is better than non-isolation structure.In this paper,the possibility of seismic isolation for secondary structure is proposed by contrast analysis,which provides a new choice for engineering isolation.