Seismic Performance Analysis Of Base Isolated Structure Of Double Steel Plate-Reinforced Concrete Composite Shear Wall

In the traditional seismic design,the researchers often used the method of increasing the stiffness of structure to against the disasters of earthquake.This way seems too passive when faced with earthquake,the anti-seismic effect is often poor.Base isolation is a new type of passive control technology.It’s aim is to set up vibration isolation device between the foundation and the upper structure.Due to the horizontal stiffness of the seismic isolation device is smaller than that of the main structure,the isolation layer can absorb and dissipate the seismic energy and separate the earthquake from transferring to the upper structure,which can reduce the seismic response of upper structure greatly and ensure the safety of structure effectively.At present,the research of base isolation mainly focus on the traditional structure.However,the seismic performance analysis of base isolated structure of Double steel plate-reinforced concrete composite shear wall is relatively few.It is of profound theoretical and practical significance to apply the technology of base isolation to the structure of Double steel plates-reinforced concrete composite shear wall.The structure of Double steel plates-reinforced concrete composite shear wall is a new type of anti-lateral force resisting system.In this system,the double steel plates are connected with vertical stiffening ribs and filled with concrete to form a combined anti-lateral force resisting system.This new type of structure system has a series of advantages:(1)Because of the concrete and the steel plates constraint with each other,this type of structure system can improve the durability and function of structure and enhance the overall seismic performance;(2)Under the same condition of bearing capacity,the application of double steel plates can lower the thickness of shear wall and lighten the weight of structure and reduce the quantity of building materials;(3)In the specific process of construction,the double steel plates can be used as concrete template to facilitate the construction program.In this paper,the technology of base isolation is proposed to be combined with the structure of Double steel plates-reinforced concrete composite shear wall,the main contents and conclusions are as follows:1)Expound the characteristics and the research situation of the Double steel plates-reinforced concrete composite shear wall and the technology of base isolation.2)Respectively to carry on dynamic analysis and to derive the dynamic differential equations to single-particle model and multi-particle model of the structure of tbase isolation.3)Taking the 16-storey structure of Double steel plates-reinforced concrete composite shear wall which under the eight degree area as an example.Using finite element analysis software SAP2000,we carry on the three-dimensional nonlinear time history analysis to the uncontrolled structure model and the base isolated structure model.The research shows that the vibration period of the structure of Double steel plates-reinforced concrete composite shear wall increases after using isolation bearing,so that the construction can avoid the period of construction sites to achieve better isolation effect.The parameters of interlayer shear,interlayer displacement and floor acceleration of the Double steel plates-reinforced concrete composite shear wall with isolation structure model are less than the response to the uncontrolled structure model under the earthquake.