| Performance of a base isolator with shape memory alloy bars |
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| 作者姓名： | Fabio Casciati Lucia Faravelli Karim Hamdaoui |
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| 作者单位： | Dept. of Structural Mechanics University of Pavia Pavia Italy，Dept. of Structural Mechanics University of Pavia Pavia Italy，Dept. of Structural Mechanics University of Pavia Pavia Italy |
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| 基金项目： | Italian National Research Council (CNR) Under Grant No CU07.00016.ST/97 |
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| 摘 要： | A new and innovative base isolation device is introduced in this paper based on extensive research carried out by the authors and their co-workers. A prototype of the device was built and experimentally tested on the shaking table. The new base isolation device consists of two disks, one vertical cylinder with an upper enlargement sustained by three horizontal cantilevers, and at least three inclined shape memory alloy (SMA) bars. The role of the SMA bars is to limit the relative motion between the base and the superstructure, to dissipate energy by their super-elastic constitutive law and to guarantee the re-centring of the device. To verify the expected performance, a prototype was built and tested under sinusoidal waves of displacement of increasing frequency with different amplitudes. It is shown that the main feature of the proposed base isolation device is that for cyclic loading, the super-elastic behavior of the alloy results in wide load-displacement loops, where a large amount of energy is dissipated.
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| 关 键 词： | 基座隔离器 动力测试 能量排除方法 震动幅度 |
| 收稿时间： | 10 November 2007 |
| 修稿时间： | 16 November 2007 |
Performance of a base isolator with shape memory alloy bars |
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| Fabio Casciati,Lucia Faravelli,Karim Hamdaoui.Performance of a base isolator with shape memory alloy bars[J].Earthquake Engineering and Engineering Vibration,2007,6(4):401-408. |
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| Authors: | Fabio Casciati Lucia Faravelli Karim Hamdaoui |
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| Institution: | Dept.of Structural Mechanics,University of Pavia,Pavia,Italy |
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| Abstract: | A new and innovative base isolation device is introduced in this paper based on extensive research carried out by the authors and their co-workers. A prototype of the device was built and experimentally tested on the shaking table. The new base isolation device consists of two disks, one vertical cylinder with an upper enlargement sustained by three horizontal cantilevers, and at least three inclined shape memory alloy (SMA) bars. The role of the SMA bars is to limit the relative motion between the base and the superstructure, to dissipate energy by their super-elastic constitutive law and to guarantee the re-centring of the device. To verify the expected performance, a prototype was built and tested under sinusoidal waves of displacement of increasing frequency with different amplitudes. It is shown that the main feature of the proposed base isolation device is that for cyclic loading, the super-elastic behavior of the alloy results in wide load-displacement loops, where a large amount of energy is dissipated. |
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| Keywords: | base isolator dynamic excitation energy dissipation shape memory alloy shaking table test |
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