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Research on Reaction of Base Isolation System in Earthquake

Author: LiuZhen
Tutor: ChenQingLai
School: Shandong University
Course: Structural Engineering
Keywords: Base Isolation Envelope diagram Time history analysis Vibration test Predominant period
CLC: TU352.12
Type: Master's thesis
Year: 2008
Downloads: 327
Quote: 14
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Abstract


Isolators for buildings is 20 years of construction work achieved in the field of major scientific and technological progress of the construction field throughout the country hundreds of experts to discuss, to seek the relevant provinces and cities and Design Institute and the University of Technology, Management expert advice and after approval of the Ministry of Construction , this technology has been incorporated into national standards, \Given the significance of the threat posed by the earthquake human survival and base isolation, contrast the advantages of traditional seismic base isolation are listed and identified the main research content of this paper. Second, the paper analyzes the base isolation control principles, a more detailed exposition on the the isolation technology development process and the application status at home and abroad, further in-depth analysis of the classification of the working principle of base isolation and a list of base isolation . For laminated rubber more mature status quo, the introduction of the concept of sliding isolation, Chapter VI test provides a theoretical basis. Then, the basic assumptions on the basis of multi-degree-of-freedom system of base isolation dynamic analysis of a simplified model system of equations of motion of the isolated structure by Abtaining listed, listed according to the damping of theoretical knowledge equivalent damping matrix is ??derived the vibration equation obtained corresponding velocity, acceleration, displacement reaction equation. Listed in two main ways, time history analysis method, method of response spectrum method for seismic response analysis method. For time history analysis method used in the Runge - Kutta method, the paper gives a more detailed integration step. Finally, since the interlayer shear force F is an important parameter to cause structural damage, so a time-history analysis of seismic acceleration becomes more important. Chapter VI on dynamic test acceleration data, and is given by programming using matlab isolation and seismic case 12 acceleration time history comparison chart, and Visio image to draw two sets of peak acceleration comparison chart. Due to the accumulation of the energy E of the upper structure directly leads to the destruction of the structure, time history analysis of seismic velocity v is more important. Chapter VI also gives a six-speed range comparison chart, Visio image to draw two sets of peak velocity comparison chart and calculate the excellent speed, excellent cycle and isolation rate. For comparison, the use of curve fitting knowledge, given three sets of acceleration envelope diagram and three sets of speed envelope diagram. Through a series of data and graphics contrast, qualitative and quantitative come to reduce the effect of earthquake damage, building structure isolation system is much better than the conclusions of the building seismic system. The base isolation is a people earlier isolation measures into practice, but has so far failed to get a good promotion and application, so in the face of powerful earthquake still can not give full play to its potential advantages. I believe that with further research, further promotion of the practical application of its future building will be able to play a strong role, to better protect people's lives and property safety.

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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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