Seismic Performance Analysis Of The Complex Plane Base Isolated Frame Structure

The structural damage caused by the earthquake is caused by the ground motion caused by the earthquake,By using isolation system using base isolation technology,the structure of flexible sliding between finite base layer and the upper structure,thus reducing the horizontal stiffness of the structure,prolong the natural period of structure,the acceleration response in the earthquake the structure effectively reduced.The traditional seismic design method can not meet the needs of engineering practice,especially some of the more complex and irregular structure.For this reason,the seismic engineers of various countries have carried out theoretical research and engineering practice of seismic isolation and shock absorption,and have made rapid development.The main work of this paper is as follows:(1)Using the finite element software Midas Gen based on the practical engineering of a plane,two models of reinforced concrete frame structures are built;(2)Modal analysis and response spectrum analysis established model;(3)The time history analysis of the two structures is carried out by choosing the appropriate seismic wave;(4)According to the different analysis methods,The seismic performance of the relatively complex structure of the plane is compared with that of the base.Through the analysis and comparison of the calculation results of the model of the complex plane frame structure,the seismic performance of the isolated structure is evaluated.Results show,After recording the input ground motion,The acceleration of the base isolated structure,the inter story displacement and inter story shear force are significantly reduced compared with the traditional seismic isolation structure,The horizontal seismic action of the complex structure is weakened,The overall seismic performance of the structure is enhanced.At last,The method of Pushover based on Midas Gen,On the static nonlinear analysis of two structures,And through the Pushover analysis of their spectral relationship curve,and then find out the structural performance point,Through the analysis of the characteristic value of the performance point,the seismic performance of the base isolation structure is enhanced,which provides a reference for the seismic isolation design of the complex structure in the future.