Development of condition evaluation system for steel structures considering redistribution of stress caused by damage progression

2021 Fiscal Year Final Research Report

• Project/Area Number: 19H02222
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 22020:Structure engineering and earthquake engineering-related
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Sasaki Eiichi 東京工業大学, 環境・社会理工学院, 教授 (40311659)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 鋼構造物 / 損傷 / 状態把握 / 計測技術

Outline of Final Research Achievements

In recent years, deterioration and damage of structures have become critical issues, and it is important to grasp the actual state of existing structures. This study aimed to construct a new state evaluating method focusing on the state changes with the progress of damage for steel structures. In particular, as a state change due to damage progress such as corrosion damage, the change of stress state such as residual stress and dead load stress in addition to the residual plate thickness are evaluated by the constructed method using originally developed eddy current based non-destructive measurement system. In this study, application of the constructed method has been attempted to evaluate the effects of fatigue damage on stress state changes and the condition of bolted joints.

Free Research Field

鋼構造

Academic Significance and Societal Importance of the Research Achievements

本研究は，鋼構造物の維持管理において，状態把握が重要視されている中で，これまで注目されてきていない，損傷進行に伴う残留応力，死荷重応力の再分配等の応力状態変化の非破壊的検出，モニタリングのための手法を独自の応力測定手法により実現し，新しい鋼構造物の状態把握の仕組みを構築しようとする内容となっている．鋼構造物の主要な損傷となる腐食損傷による影響評価，疲労損傷による影響評価のいずれも検討対象としており，鋼構造物の維持管理に関する研究としては学術的に有益であると考えられる．また，現在問題となりつつあるボルト継手の状態把握，補修補強効果の検証などの社会的課題への展開性も示されていると考えられる．