Proposal of versatile evaluation method for occurrence of Brittle fracture during earthquakes in steel structures based on the further understanding of its mechanism

2017 Fiscal Year Final Research Report

• Project/Area Number: 25820199
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Structural engineering/Earthquake engineering/Maintenance management engineering
• Research Institution: Tokyo Institute of Technology (2014-2017); Tohoku University (2013)
• Principal Investigator: Tamura Hiroshi 東京工業大学, 環境・社会理工学院, 助教 (10636434)
• Project Period (FY): 2013-04-01 – 2018-03-31
• Keywords: 地震時脆性破壊 / 修正ワイブル応力 / 鋼製橋脚

Outline of Final Research Achievements

This study was done with the aim of proposing a new evaluation method of brittle fracture during earthquakes which may occur in steel structures. Especially, we focused on the treatment of brittle fracture transition from shallow initial cracks because those fracture were not considered in existing design cords or guidelines, for example WES 2808. On the basis of trials of some fracture mechanics approaches, it was shown introducing modified Weibull stress approach is effective to consider some dominant relative factors and to estimate critical condition of brittle fracture transition during earthquakes including those from shallow initial cracks. Based on the finding, an example of simplified evaluation procedure for brittle fracture during earthquakes in beam to column connections of steel bridge piers was also provided.

Free Research Field

鋼構造