Investigation into frost damage mechanisms of masonry buildings using coupled hygrothermal and mechanical simulations

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K20462
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0304:Architecture, building engineering, and related fields
• Research Institution: Kobe University
• Principal Investigator: Fukui Kazuma 神戸大学, 工学研究科, 助教 (00908767)
• Project Period (FY): 2021-08-30 – 2023-03-31
• Keywords: 凍害 / 組積造建築 / 数値解析 / 熱水分移動 / ひずみ / Poromechanics / 異方性 / 実環境

Outline of Final Research Achievements

This study investigated the deterioration mechanisms of masonry walls due to freezing and thawing using coupled hygrothemal and mechanical simulations. First, we investigated modeling methods for the freeze-thaw processes of fired clay materials which compose masonry walls, considering the anisotropies of the material properties. Next, calculation models of a masonry wall were developed, and numerical simulations considering solar radiation and temperature changes in a cold region were conducted to clarify the season and position in a material in which the ice content and liquid water and ice pressure became high and the frost damage risks increased.

Free Research Field

建築環境工学

Academic Significance and Societal Importance of the Research Achievements

欧州では断熱改修に伴う組積造壁体の劣化リスクの変化への関心が高く、文化財建築の保存は国内外問わず急務の課題である。このような課題の解決策となりうる数値解析に用いる適切なモデルの検討を行ったことや、実験室実験では再現が難しい実際の壁体構成や環境条件を想定した劣化メカニズムを示したことは意義が大きいと考えている。今後本研究で行ったモデル化や検討手法をもとに、より広い環境条件や様々な壁体構成を考慮した凍害リスクの評価が期待できる。