A Study on Evaluation for Fatigue Strength at Weld Root using Local Stress

Research Project

Project/Area Number	20760308
Research Category	Grant-in-Aid for Young Scientists (B)
Allocation Type	Single-year Grants
Research Field	Structural engineering/Earthquake engineering/Maintenance management engineering
Research Institution	Shibaura Institute of Technology
Principal Investigator	ANAMI Kengo Shibaura Institute of Technology, 工学部, 准教授 (30272678)
Project Period (FY)	2008 – 2009
Project Status	Completed (Fiscal Year 2009)
Budget Amount *help	¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000) Fiscal Year 2009: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000) Fiscal Year 2008: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywords	鋼構造 / 疲労強度評価 / 荷重伝達型十字継手 / 溶接ルート部 / 局部応力 / 疲労強度 / 亀裂進展 / ENS法 / 亀裂進展解析
Research Abstract	Recently, fatigue problem at weld joints in steel bridge structure has been a big issue. For the effective and efficient maintenance of steel bridge structures, it is very essential to evaluate the fatigue strength properly. In this study, local stress approach for evaluating fatigue strength at weld root of load carrying cruciform weld joint was examined. As a result of this study, (1) characteristics/accuracy of existing fatigue strength evaluation methods were evaluated focusing the influences of joint geometry and stress condition, and (2) considering the application for real bridge structures, fatigue strength evaluation using stress measured on the surface of base plate was examined.