Study On Seismic Isolation Performance Of Frame Structure In Middle School Teaching Building

Seismic isolation is a technique that has been used around the world to protect building structures,nonstructural components and content from the damaging effects of earthquake ground shaking.It has also been carried out regarding seismic isolation and there is a lack of proper research on its behavior and implementing technique in low to medium seismic region.The basic intention of seismic protection systems is to decouple the building structure from the damaging components of the earthquake input motion,that is,to prevent the superstructure of the building from absorbing the earthquake energy.These thesis main contents are as follows:A four story frame structure concrete of school teaching building,the Middle School structure used PKPM software in the design and Sap2000 was used to remodel the structure,analyze and then applied the seismic base isolation.The frame structural concrete of middle school building is analyzed by time history using three ground motions and comparison with response spectrum analysis as well.This teaching building has been used lead rubber bearing,Isolators,LRB400,NRB400 and LRB500,the modal and time history analysis of isolated structure and non isolated structure were carried out,and the analysis results of two structures were being compared.The results show that the natural vibration period of the structure can be effectively prolonged and the shear forces and displacement between layers can be reduced effectively after the Structural isolation bearings are arranged.Analysis and comparison of the isolated structure and non isolated structure of their shear forces,acceleration and displacement seismic,found that isolation structure can significantly reduce the shear forces and acceleration and increased displacement.Structure’s Seismic response improves the structure seismic fortification level,which proves that the shock absorption effect is good.The results of the period of the structure are obviously prolonged by using isolation technique,which is about 3 times of the period of natural vibration of seismic structure.The acceleration of seismic wave input by seismic model and isolation model under earthquake of magnitude 8.Response,The isolation layer is arranged.The inter story displacement of the structure is increased to 22% ~ 80% of the non-isolated structure.The inter story position of the isolated structure and the non-isolated structure,the maximum inter story displacement of the frame structure decreases from 0.018 to 0.004 under the action of three seismic waves.Analysis and comparison of the isolated structure and non isolated structure of their shear forces,acceleration and displacement seismic,found that isolation structure can significantly reduce the shear forces and acceleration and increased displacement.Structures of Seismic response improve the structure seismic fortification level,which proves that the shock absorption effect is good.The use of the base isolators should be selected with a higher model strength parameter isolator in mind,especially if a significant difference is expected in the output of the structural response to the earthquake excitation.