Research Of The Base Isolation For Long-span Frame Structure In High Seismic Intensity Area

Seismicisolation structure system is a new type of passive control systemwhich is different from the traditional seismic structure system, it is usually arranged between the bottom of the building structure and the upper floors to absorb and consume the earthquake energy to reduce the seismic response of upper structure, so as to ensure the structure safety. In recent decades,the structure of the base isolation technology has shown a better effect in the actual earthquake, which greatly reduced the life threat and economic loss caused by the earthquake. Therefore, it is of great value to popularize and apply seismic isolation technology in the high intensity region.However, at present most of the structure of the isolation technology for more rules of concrete frame structure, frame shear wall structure, shear wall structure, and the single size is small, the application scope is relatively limited. The research of base isolation technology is not much for the large span spatial structure with large scale and complex structure and the corresponding technical level is relatively backward in the province.In this paper,based on the comprehensive an art school in Haikou of Hainan province for practical engineering background for research. This structure has the following characteristics:1) The structure form is the frame structure, the first three layers of it are large span column spacing greater than 30 meters and the maximum column spacing of the first floor is more than 40 meters; 2) The first floor open hole area accounted for about 50%,and rigidity is obviously weakened. In view of the above two main problems, the base isolation performance of large span frame structure is studied the main research contents include:(1)Conducting abundant reading about relative references and standards, and acquiring the basic principle,features,design processes and methods of fundamental seismic isolation technology. Meanwhile search the progress of seismic research in other areas of high seismic intensity in China.(2)Demonstrating the mechanical properties of seismic isolation bearings and establish the mechanical model and dynamic equilibrium equations of basic seismic isolation and inter-layer seismic isolation, then of seismic isolation system.deduce the solution of dynamic equilibrium equations(3)Application software ETABS to build large span frame structure seismic structure model and supplemented by YJK software to validate the correctness of the seismic model.(4) Aimed at the characteristics of the structure of the first layer of the column spacing and the slab hole are too large, the programme focuses on isolation layer design and how to solution the question of the isolation bearing top elevation is not the same horizontal plane.(4)Use ABAQUS to analyze the seismic response of structures under rare earthquake action.