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Development of Sma Semi-active Control Isolation Bearing and Its Analysis of Damping Effect

Author: FengYaYa
Tutor: LiuHaiQing
School: Liaoning Technical University
Course: Structural Engineering
Keywords: SMA semi-active isolator Shape memory effect Temperature sensing controller Semi-active control Working Mechanism Adaptive Time history analysis Isolation Damping
CLC: TU352.12
Type: Master's thesis
Year: 2009
Downloads: 71
Quote: 0
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Abstract


Based on the previous SMA strands - laminated rubber bearing based on the research , the use of temperature-sensitive controller to play SMA shape memory effect , developed a new type of vibration energy dissipation devices -SMA semi-active isolator . The article first introduces the structure control technology, isolation technology , base isolation technology, rubber bearing isolation technology and SMA research and development and related principles , analyzes laminated rubber bearings , SMA compound bearing the advantages and disadvantages , SMA proposed semi-active isolators and the theoretical analysis of the cradle and force stranded arrangement is reasonable, bearing under earthquake illustrates the working mechanism . Established based on laminated rubber bearings , SMA SMA compound bearing semi-active isolator with three different boundary conditions SDOF isolation system equations of motion , and three different support conditions under the three-tier framework modal analysis and time history response analysis, comparing the displacement and acceleration , testing and verification of semi-active isolator SNA structure under the effect of energy dissipation . The results showed that : (1) SMA wire not only increased the level of support recovery capability , but also improve its ability to resist pullout . And the temperature controller with a sense , when the isolation layer relative displacement exceeds a set threshold, the switch is closed , SMA from the martensitic transformation of austenite , the elastic modulus increases; not overrun, the switch is turned off , SMA recovery to martensite. The whole process shows a new support adaptive performance. The other foot support to overcome the restoring force is small, the shortcomings of poor adaptability . ( 2 ) based on laminated rubber bearings , SMA and SMA compound bearing isolator semi-active seismic isolation system has better isolation effect . (3) SMA semi-active seismic isolation is better than isolation bearing laminated rubber bearings and SMA compound bearing , fully verify the paper developed a new type of bearing has good energy dissipation performance is achieved semi-active control .

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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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