Earthquake Disaster Mitigation of RC Buildings in Developing Countries Based on an Experiment Study with Optical Sensing

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K18793
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 25:Social systems engineering, safety engineering, disaster prevention engineering, and related fields
• Research Institution: Osaka University
• Principal Investigator: Sanada Yasushi 大阪大学, 大学院工学研究科, 教授 (80334358)
• Co-Investigator(Kenkyū-buntansha): 松本 幸大 豊橋技術科学大学, エレクトロニクス先端融合研究所, 教授 (00435447)
• Project Period (FY): 2021-07-09 – 2023-03-31
• Keywords: 発展途上国建築 / RC / 付着 / ひずみ計測 / 光ファイバー

Outline of Final Research Achievements

Recent earthquake disasters in developing countries have revealed that reinforced concrete (RC) buildings were severely damaged because of substandard rebar arrangements. This study focused on a lack of structural integrity between rebar and concrete which was one of the most serious problems found in the earthquake-affected areas. A beam-column joint model was designed considering substandard beam rebar anchorage with insufficient length of the straight anchorage representing that in RC buildings in the developing countries. Sensing with Fiber Bragg Gratings (FBG) sensors clarified rebar strain behavior along the beam rebar anchorage with high reliability; thus, high-quality experimental data on averaged bond stress between the rebar and concrete were successfully obtained.

Free Research Field

地震防災

Academic Significance and Societal Importance of the Research Achievements

本研究の特筆すべき意義は鉄筋コンクリート造建物を対象とする従来の実験研究で得られている実験データ，とくに鉄筋とコンクリートの一体性の主指標（付着性能）に関する既存の実験データの信頼性を見直した点にある．光ファイバー式ひずみセンサ―を導入して，梁主筋の定着部の信頼性の高いひずみデータ，すなわちコンクリートとの付着性能に関する高精度な実験データを取得した点に学術的意義があり，この実験データに基づき発展途上国で見られる梁主筋が適切に定着されていない（梁主筋が定着破壊する）接合部の耐震性能を明らかにした点に社会的意義がある．