The Performance Analysis Of Frame-space Truss Hybrid Structure With Seismic Isolation Device

Base isolation structure generally refers to increase isolation layer between the main structure of the building and the lower part of the structure.Through increase the fundamental period of the isolated structure effectively avoid the characteristic period,avoiding resonance and other adverse effects.Since the lead core laminated rubber isolation bearing is used in the isolation structure,therefore it can increase the damping characteristics of the structure,which caused a large amount of seismic energy is consumed by the isolation layer,which effectively weaken the earthquake action for the main structure of the damage.This paper begins with mechanical properties of base isolation bearings and analysis of space truss structure and lower supporting structure and mechanics analysis model of base isolation structure.Through the finite element software YJK,established the seismic model and isolation model of frame-space truss hybrid structure.Thus two kinds of calculation data can be obtained, include floor shear, floor displacement, story drift, bottom shear force of the bottom column, the force of space truss.Through comparative analysis.At the same time,the influence of the parameters of the isolation device on the seismic response and the overall anti overturning performance of the structure are analyzed.Comparative analysis of the calculated data of base isolated structure and traditional seismic structure,the base isolated structure under the influence of earthquake force, the floor shear,the horizontal displacement of the floor, the displacement between the floors, the bottom shear force of the bottom column, the axial force of the space truss are all reduced in different degrees.Through discussion on the specific parameters of isolation bearing,which obtained the effect of mass, damping and horizontal stiffness to structure isolation effect.Research on the reason of the collapse of the base isolation structure and the derivation of the high aspect ratio.To sum up,the anti overturning measures of base isolation structures.Analysis the base isolation structure of hybrid structure by concrete frame structure and Space truss structure,revealed the characteristics and advantages of the base isolation structure.which provides the basis for engineering application.