由於圖書館的書架缺少抗震措施和穩定性不夠。民國88年的921和1022兩次大地震對台灣中部的一些圖書館造成了重大的損傷。本研究之目的在於分析和說明造成這兩個問題的主要原因及可能的處理方式，並為館方提供一些耐震考慮因素以選擇適當的防範措施。

　　本研究包含以下內容：
1. 收集針對各種圖書館自立式書架的破壞形式，並試圖瞭解自立式書架在強震下破壞的原因。
2. 利用系統識別試驗來確定自立式書架的動力行為，包括其自振頻率。
3. 系統識別試驗與動態破壞性試驗
4. 在瞭解自立式書架的基本性質和破壞原因後，最後以功能設計（Performance Based Design）的觀念來建立一套書架安全的評估和設計準則。

　　自立式書架的穩定行為複雜。下部未採錨定螺栓或螺栓補強不良的書架，遭受地震攻擊時會呈現不穩定現象。依地震對書架攻擊的方向，基本上書架有兩種不穩定的問題，面內不穩定及面外不穩定，而形成書架各種破壞。

　　研究發現以下特性：
1. 面內不穩定
1) 地震力中與書架長軸平行的縱向力，發生書架面內不穩定。自立式書架可能扭曲變形、傾倒、位移、上下跳動。
2) 交叉斜撐是書架抵抗縱向地震力的重要措施。若斜撐兩端僅以套勾方式連結主構件，則極易在地震下跳脫，而失去斜撐功能。

2. 面外不穩定
1) 圖書館書架所造成的傷害，以面外不穩定破壞最大，一排排的書架會因骨牌效應倒塌。
2) 自立式書架對橫向力抵抗性較弱。書架應錨定於地面上，將書架與建築物合為一體，降低書架本身的搖晃性，減少它對書架的傷害。
3) 最根本的方法是在書架的頂端以金屬桿件，將書架在橫向上連接起來，地震時可將書架的搖晃性藉此支架傳至其他書架，共同分擔地震力的影響。

　　Owing to the instability of and lack of earthquake-resistance devices in their shelving equipment, several libraries suffered serious damage in the two Taiwanese earthquakes of 1999. The purpose of this experiment is to analyze the main reasons for those problems, and to introduce some methods to counter them.

　　This research can be split into four sections:
1. The history of cantilever library shelving failure was studied in order to discover why various types of shelves were destroyed under strong excitation.
2. System identification tests are a convenient means by which to identify the dynamic behavior of cantilever library shelves, including their fundamental frequencies.
3. Here follows the process of testing cantilever shelf materials for earthquake resistance properties: System Identification Test and Dynamic Breakdown Test
4. After studying the basic properties of the material and the conditions under which they destruct, methods to strengthen the anti-seismic capability of cantilever library shelves. A set of seismic safety standards for both library shelving in general and cantilever library shelves in particular according to the concept of Performance-Based-Design is established.

　　Earthquakes can be expected to cause vibrational motions in freestanding book shelves, which, since they are often not fastened or are inadequately anchored, may cause damage by falling or toppling over. One can narrow down various instability issues into two groups: in-plane and out-of-plane.

　　In-plan instability：
1. In-plane instability occurs when the ground moves in the longitudinal direction with respect to the stack range. The freestanding shelve system may either sway, overturn, slide, or jump from its original position.
2. The shelves themselves remain intact due to the use of steel cross braces in between the two sides of a double faced bracket section, which provide adequate rigidity for each section. But if brace ends were only hooked at the connection points, these ends may be loosened in the earthquake motion and render bracings useless.

Out-of-plane instability：
1. Out-of-plane instability is a matter of greater importance because of the possibility of a ‘domino effect’ collapse, which can be highly dangerous.
2. The lack of out-of-plane stability in freestanding shelves can be alleviated by employing proper anchoring and other stabilization methods.
3. A highly effective method for stiffening rows of freestanding shelves is to use the installed steel channels or strut channels. Top bracing is the surest method against overturning and minimizes the number of books falling off of shelves.

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