Seismic Performance Analysis Of Irregular Frame Structure Based On Composite Isolation

In traditional anti-seismic structure design,building structure is adopted by the strength of the material and related structures through plastic deformation of the ability to resist seismic forces,but under severe earthquake,the seismic capacity is limited.The seismic response of the superstructure can be greatly reduced by isolating the building structure and the foundation by setting the isolation layer,which dissipates most of the seismic energy.Based on the previous researches on the isolation of building structures,this dissertation further studies the seismic performance of the irregular frame structure based on composite isolation.The structure of the isolation layer is called the base composite isolation structure by combining the friction-sliding isolation bearing and the lead core laminated rubber isolator.In order to study the seismic performance of irregular frame structure based on composite isolation,finite element analysis software was used to establish the finite element model of irregular frame structure.Through different angles of irregular frame structure seismic performance based on the composite isolation were studied,the irregular frame structure design based on composite isolation has certain reference value.Based on the basic compound isolation structure,this dissertation studies the following aspects:1.It introduces the basic theory of isolation structure in detail,including: classifications of building isolation,types of isolation support,and numerical simulation methods of isolation support.The dynamic analysis method of the composite isolation structure is introduced in detail,including the analysis model and the vibration equation and the vibration equation of the multi-particle composite vibration isolation system.2.It chooses three ground motions,respectively carried out in accordance with the PGA seismic intensity modulation parameters.The ground motions are traditional anti-seismic structure,pure lead laminated rubber vibration isolation structure and composite structure.Accordance with the requirements of seismic design code of China,the paper does the contrast analysis of the structure under seismic action of different maximum displacement,maximum interlaminar shear between the layers,each layer relative acceleration and composite structure parameter analysis of vibration isolation effect.3.On the basis of the above two parts content research,further under the action of the rarely earthquake based on composite isolation energy response of irregular frame structure is analyzed,through irregular frame structure under different forms of isolation of energy analysis,different ground motions under the action of impact on the composite structure of energy consumption analysis of composite structure and isolation bearing parameters on the structure of the isolation layer analysis,the influences of the energy consumption are discussed from the point of view of energy based on the composite isolation of irregular frame structure seismic performance.