RC建築結構體建材用量與碳排放量之影響因子研究

Factors Affecting the Material Usage and Carbon Emission of RC Building Structures A Case Study on the Countertop Height of Kitchen Sink for Female in Taiwan

本文以中層辦公大樓為原型，探討各種設計因子對建築結構體建材用量及碳排放量之影響。共設定18組案例電腦結構模型，依照台灣一般結構設計流程實際執行分析與斷面設計，精算混凝土與鋼筋用量，再依照本土碳排資料庫換算碳排量。分析結果發現樓層數、震區、跨距變化、靜載重及活載重皆與建材用量及碳排量有顯著正相關。根據上述因子建立建築結構體碳排量簡易評估公式，與集合住宅實際案例之比對結果顯示，本文簡易評估公式若採原型基準值則略偏低估，若採保守設計基準值則略偏保守，但誤差平均皆在5％以內，顯示本文公式可提供合理評估。

Eighteen computer structural models of mid-rise office building were analyzed to study the factors affecting the material usage and CO2 emission. Section dimension and steel ratio were designed in accordance with the Taiwan building codes. The concrete and steel usage were calculated and then converted into the CO2 emission with a Taiwan-based carbon databank. The analysis results showed that the material usage and carbon emission increase as the story number, seismic zone, span change, dead load, and live load increase. A rapid estimation equation is developed by including these factors. Comparison with actual residence buildings shows that the developed equation slightly underestimates the CO2 emission. Modified equation by using the conservative design case result instead of the prototype result shows conservative estimation. Both equations have an average error lower than 5% and therefore can be considered reasonable.