Research On The Seismic Performance Of The Framed -tube Structures With Rubber Bearing

With the rapid growth of national economy in our country, more and more high-rise buildings, frame-tube structure, as a kind of common structure form is widely used. Through the arrangement of rubber bearing isolation layer frame tube structure to increase the ductility of the structure, make the structure in the earthquake can consume the earthquake energy as much as possible, so as to achieve good seismic effect. In this paper after using rubber bearing frame-core tube structure under seismic action of isolation vibration problems, relying on the national natural science fund project (51378168) and the basic scientific research in colleges and universities were a special fund project (2012hgzy0024), using Midas software for finite element analysis.Isolation technology is generally in the first floor and the bottom of the vertical component-based connections or set of isolation devices as needed in the corresponding floor building structure. Compared with conventional seismic structure, isolated structure is an active control technology, the use of seismic isolation devices to prevent the seismic wave energy transfer to the upper structure, thereby reducing the impact of the earthquake on the upper part of the building. With the increasing maturity of isolation technology theory and in practical engineering applications constantly, for the development and promotion of isolation technology brings a broad prospect. In practical engineering applications, the position of the seismic isolation device layout can be divided into two kinds of base isolation shock layer spacing. Currently, the research base isolation of this technology has also written more mature country norms, in engineering, there are many examples of use. However, the working mechanism of story isolation and damping effect is not very clear indeed, require further study. Therefore, this layer of base isolation and shock damping effect of the interval through theoretical derivation of numerical simulation and finite element analysis, compared with the original traditional structure, comparative analysis of the different properties of these two isolation system.This Article describes the mechanical properties of isolator establish interlayer seismic base isolation and mechanical model and the dynamic equilibrium equations, solving the isolation system and derive the dynamic equilibrium equations, and finally through the finite element analysis software Midas gen for adoption isolator base isolation and place twenty-story isolation structure layer on top of the vertical component modal analysis and dynamic in the horizontal earthquake time history analysis to calculate the data and compare the original structure, analyzed the damping.Research on vibration isolation characteristics of the structure.Through comparative analysis of three kinds of the top 12 bands vibration period and the first three modes of program structure, draw isolation layer on frame-core tube structure vibration characteristics of the law. The results show that rubber bearings are arranged so that the frame-the overall stiffness of the core tube structure becomes smaller, so the natural circular frequency of the structure is reduced, thereby increasing the natural cycle. It can be seen using the isolation device can effectively extend the structure vibration period, thus avoiding excellent venue to mitigate earthquake cycle.Under the horizontal seismic isolation structure study displacements and internal forces affecting the response. History analysis method to calculate the seismic response of the structure of the programs when using power, and interlayer seismic base isolation have significant damping effect. Isolation layer different locations have a greater impact on the damping effect and damping mechanism of the whole structure. When placed in the structure of the middle layer of isolation, floor acceleration and shear displacement of its superstructure and substructure has different trends.Finally, the effects of changes in the structure of the seismic isolation device parameters on the dynamic response, seismic isolation devices for reasonable selection of optimal design parameters and the isolated structure to provide a reference, and analyzes of the isolated structure deduced aspect ratio limit.