| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| 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.
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