Research On Seismic Performance Of Frame Structures With Isolation

As one of the earthquake-prone countries,in recent decades,It has suffered a huge economic loss because of earthquake.Nowadays,with the rapid development of economy and technology,people pay more attention to the safety of the structure,more secure and reliable seismic technology has become the focus of seismic research.isolation technology came into being,it is the most prominent research results in the last 50 years.And it has been widely used in the project,some of these isolated buildings experienced the earthquake test,and performed well in the earthquake.In this paper,the isolation effect of friction pendulum isolation bearing and rubber isolation bearing in building structure are analyzed.(1)It analyzed a four-story steel frame structure with Isolation analysis program 3D-BASIS-ME.It assumed two different situations,one is isolated,the other is non-isolated,and then,input seismic waves El centro wave(0.35g),Taft wave(0.2g),Tangshan wave(0.1g)respectively.And obtained the isolation effect under the earthquake conditions.Then,change the stiffness of the friction pendulum bearing,and input the same seismic wave to analyze the influence of the stiffness of the isolation bearing on the isolation effect.(2)It analyzed a five-story RC frame structure based on the large-scale finite element analysis software Open Sees,under the action of a seven-degree rare earthquake(peak acceleration of 220gal).In this paper,the dynamic time history analysis of non-isolated RC frame is carried out,and the weak structure is found.Then,the isolation base is installed on the structural foundation layer,the weak layer and the top of the structure,and the modal analysis is carried out.The influence of the position of the isolation bearing on the period and frequency of the first six modes of the structure is compared.Finally,the dynamic time history analysis of each structural model is carried out by using the northern boundary seismic wave with a peak acceleration of 0.2g,and the changes of the floor acceleration and the shear force of the floor are obtained under different isolation schemes.The research shows that the isolation technology is a kind of seismic technology with obvious effect,among which the factors that affect the isolation effect are complicated,not only with the characteristics of the isolation bearing itself,but also with the arrangement of the isolation bearing,,Seismic wave species,site categories and so on.