Long service life, reuse and recycling are counted as three major measures for reducing environmental burden. However, the effects of these measures are not clearly defined, therefore, quantitative evaluation and investigation are required. This study conducts case studies on scenarios presumed for the environmental burden reduction for mid-rise steel structure apartment houses. Service life period of buildings, reuse rate of members and recycling rate of materials are considered as parameters. The study pays attention not only to the life cycle CO_2 (LCCO_2) but also to the amount of wastes.
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