Developing An Evaluation Method for Ductile Crack Initiation in Steel Structures with Welding Defects

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560588
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Structural engineering/Earthquake engineering/Maintenance management engineering
• Research Institution: Meijo University
• Principal Investigator: GE Hanbin 名城大学, 理工学部, 教授 (90262873)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 鋼構造 / 鋼製橋脚 / 溶接欠陥 / 延性き裂 / 脆性破壊 / 耐震性能 / 繰り返し載荷実験 / 弾塑性解析

Outline of Final Research Achievements

In this study, cyclic loading tests and FEM analyses were conducted to investigate the ductile crack initiation and final failure mode in thick-walled steel structures with welding defect. To clarify the fracture mechanism of beam-column connections and investigate progress of ductile crack which will result in brittle fracture due to the huge earthquake, cyclic loading tests were conducted by using beam-column connection specimens which have welding defects in the butt flange joint at which full penetration welding should be done. Furthermore, to evaluate the ductile crack initiation, FEM analysis using shell and solid elements were conducted. Based on the plastic strain range which was obtained from the FEM analysis, investigation of the ductile crack initiation was conducted. As a result of series of experiments and analyses, fracture mechanism of the beam-column connection with welding defects and applicability of the ductile crack initiation evaluation were clarified.

Free Research Field

構造工学・耐震工学