| 研究生: |
黃中興 Huang, Chung-Shing |
|---|---|
| 論文名稱: |
移動式設備物之滑磁耐震機制探討 A study on strengthening the seismic capacity of mobile equipments by a magnetic isolation system |
| 指導教授: |
姚昭智
Yao, Chao-Chih |
| 學位類別: |
碩士 Master |
| 系所名稱: |
規劃與設計學院 - 建築學系 Department of Architecture |
| 論文出版年: | 2003 |
| 畢業學年度: | 91 |
| 語文別: | 中文 |
| 論文頁數: | 123 |
| 中文關鍵詞: | 移動式設備物 、磁力固定 、鐵板 、摩擦耗能 、滑磁耐震機制 、移動式設備 、滑磁系統 |
| 外文關鍵詞: | sliding magnet isolator, mobile equipment, electromagnetic anchorage, steel plate, energy dissipation |
| 相關次數: | 點閱:103 下載:7 |
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需要移動的設備往往因操作麻煩、或其他限制等原因不易做好防震固定,以致於設備物在強地震下屢屢產生嚴重的損失。本研究探討一個對於移動式設備物固定的方式:「磁力固定設備物機制」。其基本原理為:將可方便充磁與脫磁的電磁鐵安排在設備儀器的底部或側面,利用充磁後產生的強大吸力將設備物固定於樓板上或牆壁上所黏貼之鐵板而達到抗震的效果。
本研究實驗探討將磁力應用在垂直固定展示櫃於樓板上,與水平固定病床於牆壁上,並藉震動模擬台對其做耐震性能測試,綜合其結果得到以下利用磁力固定設備物之特性:
1.充磁與脫磁容易、移動方便、不需破壞樓板、且較隔震器便宜許多。
2.利用磁力來固定,不增加設備物重量,故無慣性力與樓板承載力之問題。
3.越大的磁力,可抵抗到越大的地表加速度後,才使設備儀器產生初始的滑移或脫開現象。
4.磁力固定展示櫃,在垂直地面方向可防止展示櫃產生翻轉甚至傾倒;而在平行地面方向可提供滑移摩擦耗能的特性,使展示平台部分的加速度在展示櫃產生滑移後逐漸趨於一常數,有助於櫃內展示品的耐震環境,確保展示品的安全。
5.可藉改變磁力大小與電磁鐵與鐵板間的摩擦係數兩項因素,來控制設備物被磁力固定後在地震中主要的運動行為與摩擦耗能特性。
由實驗結果可知,此種利用磁力來固定設備物的機制,不僅簡易操作,也能達到固定設備物的功能,本研究稱此機制為「滑磁系統」。
Many building equipment were damaged in past earthquakes due to lack of easy-to-use seismic resistant measures to prevent from overturning or sliding . This study suggests a new seismic resistant measure on mobile equipment : 「 To strengthen the seismic capacity of mobile equipment by magnetic force」. The first step is to install an energy saving electromagnetic chuck beneath or beside the equipment and to place a steel plate to the floor or to the dry wall with 3M’s double-face stickers. When charged by current, the electromagnetic chucks produce sufficient magnetic force which helps to attach the equipment to the steel plate, thus the equipment is anchored.
This study has investigated the performance of this new measure by shaking table tests in two kinds of equipments :
1.Show cases in museum, vertically fixed to steel plate on floor by magnetic force.
2.Hospital beds, horizontally fixed to steel plate on dry wall by magnetic force.
After the tests, several properties of mobile equipment fixed by magnetic force were founded:
1.The advantage is easy to operate, easy to move, no damage on the floor , and much cheaper than isolators .
2.Magnetic force won’t produce inertia force to the equipment nor extra bearing weight on the floor.
3.To prevent equipment from overturning or sliding, the stronger the magnetic force is used, the more seismic capacity the equipment has.
4.Strengthened by magnetic force, the show case on one hand was prevented from rocking, and on the other hand was allowed to slide moderately on the surface of the steel plate. This behavior provides the energy dissipation and reduces the acceleration of exhibition items inside the show case.
5.Analysis revealed that the vibration patterns of equipment and energy dissipation under seismic excitation are controlled by two factors:
1). The magnetic force
2). The friction between electromagnets and steel plate
In conclusion, strengthening the seismic capacity of mobile equipment by magnetic force, which is named “Sliding Magnet Isolators(SMI)”, is easy to operate and can provide sufficient seismic capacity to the mobile equipment.
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