現今的臺北市，其平均屋齡在2022年已達36.2年，且超過30年以上的建築物占現存建築物的87.4%，顯示臺北市建築物更新換代已然刻不容緩，建築材料的使用勢必隨著汰舊換新的過程而有所增加。然在自然資源匱乏的今日為減少自然資源的開發，與其放任營建廢棄物對環境造成破壞，不如就地取材將廢棄物再利用。故本研究探查臺北市區內1971至2020年的建物分佈，與其蘊藏建材存量數量與群聚狀態，並以此判斷未來數年內能夠被拆除轉化成為潛在二級原料的數量預估值以及其開採地區。
其次，透過臺灣建築個案的分析獲知四大建築類別的主要建材物質強度，結合每年建物樓地板新增面積，並納入空間資訊與區域性空間自相關指標等，進而估算歷年新增建材存量，並探究臺北市內12區456里之間鄰近空間單位內新增建材存量的群聚程度與分佈。其次，加入兩種建築壽命的情境(經濟使用年限以及物理使用年限)，量化累計建材存量與拆除預估量，藉此推算臺北市內二級原料開採分佈區域及其潛在開採量。
研究結果顯示自1985年起，每年新增建材存量開始下降，2020年的新增建材存量僅剩306萬噸，略低於1984年新增建材存量(1150萬噸)高峰的三成(26.6%)。1985年前的區域建材存量以大安區為首，1990年至2020年間，內湖區因工業及商業的發展，其新增建築物質存量在占比逐漸增加，新建熱區由臺北市中心轉移至內湖區。同樣的，無論在經濟使用年限或物理使用年限的情境下，1990年後的累計建材存量(四種大宗資材)主要聚集區坐落在內湖區一帶。另外，根據物理使用年限設定之分析結果，2021年至2025年間，營建廢棄物的主要產出區為大安區及松山區，有望成為近幾年潛在的二級原料開採區域。

In recent years, implementing a circular economy in cities has been considered as a potential solution for realizing sustainability. At the end of 2021, approximately 87.4% of buildings in Taipei City are over 30 years old, meaning the demolition material flows and inflows of building materials are expected to grow due to urban renewal activities in the coming years. To reduce the usage of natural resources, as well as the demolition waste, the application of secondary material streams could relieve such pressure with a circular approach. Yet, inflows and outflows of construction materials should be identified to estimate the amount and the location of accumulated building stocks, which are treated as potential urban mine.
For this study, the material intensities of 4 main building materials for 4 building types are assessed with 32 case studies, combined with building use permit data, and 2 scenarios of building lifetime, gross additions to building stocks, accumulated building stocks, and the predicted outflows of demolition wastes are quantified within Taipei City. Also, to understand the spatial characteristic of building stocks, the quantities, and locations of spatial clusters of gross additions to building stocks are analyzed with LISA. The results show that the inventory of new building stocks has been declining since 1985. Da'an District contained the highest building stocks until 1984, then shifted to Neihu District afterward. Hot spot maps are produced for each material to identify where the building stocks are most spatially concentrated. Finally, Da'an District and Songshan District are revealed to be the main regions for secondary raw material extraction from 2021 to 2025.

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