レトロフィット建築における複合的な設計条件から設計解を決定するツリーモデル

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  • A TREE-BASED MODEL TO DETERMINE DESIGN DECISIONS FROM MULTIPLE ARCHITECTURAL CONDITIONS IN THE RETROFIT ARCHITECTURE
  • レトロフィット ケンチク ニ オケル フクゴウテキ ナ セッケイ ジョウケン カラ セッケイカイ オ ケッテイ スル ツリーモデル

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<p> The purpose of this study was to reveal the relationship between “architectural conditions” and “design decisions” of retrofit architecture, using statistical analyses: cluster analysis and decision tree analysis.</p><p> </p><p> The subjects of this study were 93 cases of retrofitted modern architecture, which were printed in the magazine, Shinkenchiku, from 1974 to 2017. First of all, we set 8 items as “architectural conditions” such as building area and cultural properties, and also set 20 items as design decisions. In our previous paper, we set "design decisions" as a quantified data set of each retrofit architecture based on the similarity of the old and the new. In this paper, we newly added "the distance between the old and the new" into these data sets. Then, we prepared a matrix whose rows represented the 93 subjects and whose columns include both the architectural conditions and the design decisions.</p><p> </p><p> First, the data were analyzed in the Ward’s clustering method, defining the dissimilarity as the squared Euclidean distance. From this analysis, we obtained 5 characteristic types of the design decisions: Similarity type(S), Separation and contrast type (Cs), Butt joint and contract type (Cb), Shape similarity type (Ss) and Neutrality type (N). Then we examined the structural relationship between these 5 characteristic types and the architectural conditions using the decision tree analysis, in which response variables are the 5 characteristic types and the explanatory variables are architectural conditions.</p><p> </p><p> With these two analyses, we concluded that architectural conditions of “extension on top and side”, “type of original structure” and “change on building uses” would be the multiple factors of making each design decision.</p>

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