Development of a risk assessment method for damage of the roof of a wooden house considering the effects of aging

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K15009
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 25030:Disaster prevention engineering-related
• Research Institution: Hachinohe National College of Technology
• Principal Investigator: Konno Daisuke 八戸工業高等専門学校, その他部局等, 助教 (00825325)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 強風災害リスク評価 / 実物大動風圧試験 / 窓ガラス / 外装材 / 耐風設計 / リング曲げ試験

Outline of Final Research Achievements

In this study, we expanded the strength information of building exterior materials such as roofing materials and window glass with the aim of reducing damage to buildings in the event of high wind disasters. In order to evaluate the strength reduction of float glass, which is commonly used in buildings, by aging, we conducted (1) breakage experiments of window glass taken from existing buildings and (2) breakage experiments of window glass loaded pressure.
In the experiment (1), it was found that the strength of window glass that had been used for a long period of time was reduced by up to 80% compared to that of new glass.
In the experiment (2), the strength reduction phenomenon could not be confirmed by arbitrary pressure loading, but the influence of loading time on the strength reduction was obtained.

Free Research Field

建築構造学，風工学

Academic Significance and Societal Importance of the Research Achievements

本研究で得られた成果は，台風や竜巻といった強風災害による建物被害の低減に寄与することができると考えられる。
一般に，強風時の建物破壊のメカニズムとしては，窓ガラスのような開口部が強風や飛来物によって破壊され，そこから強風が吹きこむことにより建物全体の被害に繋がるとされているため，被害の起点である窓ガラスの耐力評価を行うことは被害低減に向けて重要である。
また，過去にあまり例を見ない経年劣化による窓ガラスの強度低下を確認できたことの意義は大きく，既存の建物の改修や修繕，開口部の保護などを促進する上で重要な知見であるといえる。