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Research on Theory and Application of Story Isolated Twin Tower Structure with Large Base

Author: LiuYongJun
Tutor: ZhaoZuoDong
School: Xi'an University of Architecture and Technology
Course: Modern structure theory
Keywords: twin tower structure with a large base story isolation lead rubber bearing earthquake response history analysis
CLC: TU352.12
Type: Master's thesis
Year: 2011
Downloads: 37
Quote: 1
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Abstract

Along with the acceleration of urbanization, now, the high-rise tower buildings with large base are surging into our eyesight. The 1st to the 3rd floors of the buildings along the main roads or the streets are designed to the large base as shopping malls, the hotels or the offices. The paper studies the twin tower structures with large base, which is a most commonly-seen type in the high-rise tower buildings. The section of the large base is framed structure or the framed-shear wall structure, while the upper sections which are mainly designed as the twin towers which are the symmetrical or asymmetrical structures. The structures of the tower buildings with large base are irregularly built in verticality, therefore, a sudden change between the base and the upper structure may lead to the mutation in their stiffness, which becomes a weak links for the architecture. Therefore, how to ensure the security of this structure under the action of the earthquake has become a crucial aspect in this structures’designing.Isolation technology is one of the most representative technologies of seismic resistance of structures in the 20th century, which has displayed its excellent anti-seismic performance in earthquakes at home and abroad. From the results of the model experiment and the records that obtained from the strong earthquakes , we know that the acceleration response of such structures is only 1/4~1/8 to that of the traditional anti-seismic architecture. What’s more, the application of this technology can reduce the seismic shock of the upper structure, which can correspondingly reduce the total cost by decreasing the structure section or reducing the number of reinforcement. The storey isolation technology is to set the seismic devices with a little horizontal stiffness at the top of the pillar in a certain floor, which is mainly reliant on the great level of distortion and consumption of the seismic layer to isolate the transmission of the seismic waves to the upper structures, thus to ensure the safety and normal function of the buildings.This study applies the seismic isolation technology to the twin tower structure with a large base. The sudden conversion between the large base and the upper structure has made the section of the structure the venerable part, therefore, the author set the isolation layer on top of the base and carry on the analysis by taking the theory of storey isolationIn the paper, the author gives a brief introduction to the concept of isolation technology and the application and development at home and abroad. Next the author gives a brief description to the functions and the requirements of the common seismic devices, and then the author derives the dynamics equation of motion for the twin tower anti-seismic structures with large base. And lastly the author demonstrates the outstanding effects of isolation technology in the twin tower structures by taking a real project as an example, and using the SAP2000 finite elements analytic software to make the following comparisons between the two structures with traditional and isolation technology design, they are: the natural vibration characteristics, acceleration response, relative displacement response, storey shear response. And finally, the significance of the research is to provide the theoretical supports of the practical applications of such projects.

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CLC: > Industrial Technology > Building Science > Building structure > Special Structure > Anti - shock structure,disaster prevention structures > Shock, isolation, and explosion-proof structure > Isolated structure
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