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Research on the Dynamic Response of SMA—Sliding Isolation Structure Subject to Near-fault Earthquake

Author: LiSong
Tutor: DuYongFeng
School: Lanzhou University of Technology
Course: Disaster Prevention and Reduction Engineering and Protective Engineering
Keywords: near-fault earthquake sliding isolation bearing shape memory alloy time—history method
CLC: TU352.12
Type: Master's thesis
Year: 2011
Downloads: 48
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Abstract


The structure vibration control is a new method of anti-earthquake in civil engineer.Because of the mature theory,the base isolation is adopted widely. The good effect of shock absorption of sliding base isolation structure is widely accepted in the far-fault area. However, the distinct long-duration pulse motion of ground velocity and displacement in the near-fault region may cause the adverse influence on the seismic performance and design of the sliding base isolation buildings. And the isolation layer of the base-isolated structure may cause a great slipping, which may make the structures be in serious damage.So it is very important to research the residual displacement of the Shear-type structure. Shape Memory Alloy (SMA) has been widely accepted because of its large damp , pseudo–elasticity , fatigue resistance, and corrosion resistance.So this paper gives out a new SMA—sliding isolation bearing,which is composed of SMA wire and sliding isolation bearing,and the research on the dynamic response of the new SMA—sliding isolation bearing subjected to the far-fault earthquake and the near—fault earthquake is made. The main contents studied in this paper are as follows::Introduce the basic characteristics of near-fault ground motion, the study status of the sliding isolation system, the character of Shape Memory Alloy(SMA)and the application of SMA in the field of the civil engineering.Based on the super-elastic properties of shape memory alloy, the author designs a new SMA - sliding isolation bearing, expounds the structural ways and the principle of operation the SMA—sliding bearing,and presents the restoring force model of the bearings.Then the selection of SMA silk for the new SMA-sliding bearing is discussed preliminary. At last the dynamic equation of the structure under the fixed support, sliding bearing and SMA - sliding bearing is built,and Newmark—βmethod is proposed to solve the equations of motion.Analyzed in comparison that the influence of structural seismic response subjected to the far-fault earthquake and the near—fault earthquake and with different amplitudes about general structure,sliding isolation bearing and SMA—sliding isolation bearing.The study result shows that the new SMA—sliding bearings proposed in this paper has nice isolation effect. the seismic response of the super-structure is significantly reduced , and the fully re-centring capacity after earthquake is obtained .So it can be used in the actual engineerings.

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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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