人類之過度開發不僅消耗地球資源，同時也製造大量廢棄物對環境造成危害，如能做到資源回收再生與重複利用，將能有效減少廢棄物，降低環境汙染。本研究以一座即將被拆除廢棄的既有木構架構造物探討再利用之可行性，由於木構架所使用的木材為未達使用壽命之南方松，而南方松常灌注化學藥劑以達到防蟲防腐的功效，因此不論丟棄或是回收製成木屑再利用皆會對環境造成傷害。本研究將此批木構材直接作為構材使用，不經過二次加工再製，發揮其使用年限內的最大效益。
本研究在拆除舊有木構架後，回收既有木構材，觀察構材損傷情形，再對舊有木構材與新購木材進行材料試驗，比對新舊材料含水率、密度與抗壓、抗剪強度等差異性，並確認舊有木構材材料強度仍滿足台灣與美國現行木構規範，可繼續作為結構材使用。本研究以成功大學建築系館內兩處走廊作為設計基地，將回收之既有木構材作為主要結構材料進行設計，在不破壞基地原有結構體的前提下，以基地建築結構體提供反力支承，達成基本之平衡條件，搭建一座可自立的二次結構，此結構可附掛於走廊以增加使用空間。將設計之結構體經由SAP2000結構分析軟體進行分析，了解整體結構力學行為，並以台灣木構規範進行檢討，使各構件所受應力小於規範之容許應力，確保結構安全。針對應力過大構件，採取相應對策更改設計，在不改變使用材料的情形下，以變更跨距或增加構建等方式降低各構件應力。
本研究最終透過實際構築，驗證前述設計的可行性。實構過程依具備之工具發展設計細部接頭，評估重量及可取得之人力或工具條件，決定組構形式或結構體尺度，並且依據在施工過程中實際遭遇之困難，提出不同之應對方法解決。在考量多方影響因素，並且反覆修正設計後，完成自立式二次結構之構築，實踐形體設計、結構分析、構築施工多方面的設計決策整合。

The development of human civilization causes over-exploitation of natural resources and produces a lot of waste. Recycling and reusing products are effective means to decrease the waste and environmental pollution. This thesis aims to discuss the feasibility of reusing aged southern pine lumber removed from an existing wooden construction. The discard or reproduction of used southern pine lumber causes environmental problems since it is usually treated with chemistry antiseptic. In order to extend the service life of the lumber and reduce the harm to environment, this thesis repurposes the lumber in its original shape in place of reprocessing it.
The wooden construction was carefully dismantled. The members was classified according to size, shape, and damage condition. The mechanical properties of the lumber, including density, water content, compressive and shear strengths, were tested and compared with new bought lumber. The test results show that the aged lumber still satisfies the regulations in both Taiwan and U.S. codes for wood structures and can be reused as structural components. The recycled lumber was used to build a self-supported secondary structure that is attached to existing building corridor and provides additional space. Two different designs were developed for two possible sites in the department of architecture at National Cheng Kung University. During the design stage, structural analysis by using SAP2000 was performed to understand the structural behavior and check if the stress demand exceeds the allowable stress. Since given member sections are used, the design and structural system are modified according to the stress demand.
One of the designs was actually constructed to verify its feasibility. The scale of prefabricated parts and construction details were developed according to the restriction of equipments, human power, and site condition. The final design was then determined based on the feedback from construction process. This study demonstrated the integration of
conceptual design, structural analysis, and construction, and achieved the objective of repurposing the used lumber as a self-supported structure.

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