Effect Evaluation of Heterogeneous Damage in Concrete Due to its Volumatic Change on Shear Property in Reinforced Concrete Beams(Fostering Joint International Research)

2017 Fiscal Year Final Research Report

• Project/Area Number: 15KK0208
• Research Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research)
• Allocation Type: Multi-year Fund
• Research Field: Structural engineering/Earthquake engineering/Maintenance management engineering
• Research Institution: Kobe University
• Principal Investigator: Miki Tomohiro 神戸大学, 工学研究科, 准教授 (30401540)
• Research Collaborator: Benson Shing University of California, Department of Structural Engineering, Professor and Chair
• Project Period (FY): 2016 – 2017
• Keywords: 微細ひび割れ / ASR / 初期応力 / 弾性係数 / 超高強度繊維補強セメント系材料 / せん断耐力 / 画像解析 / プレキャストコンクリート橋脚

Outline of Final Research Achievements

This study aims a development for an accurate evaluation of the seismic performance of existing concrete structures and resilience after a severe earthquake. The performance of concrete structural members damaged due to material deteriorations such as the Alkali-Silica Reaction (ASR) has been evaluated. In addition, the target is extended to the high strength concrete members. In the experiment, an image analysis was conducted by means of an image correction method in order to determine a crack propagation in the ASR damaged concrete under tension or compression stresses. The image-based detection for a very brittle compressive failure in the ultra-high strength fiber reinforced cementitious materials were successively carried out using a high-speed camera and its harmonized data accumulation system. Nonlinear analysis for precast concrete bridge columns was also conducted to be investigated in the extended technology for a large domain of the image analysis developed here.

Free Research Field

コンクリート構造