|Budget Amount *help
¥5,700,000 (Direct Cost: ¥5,700,000)
Fiscal Year 2003: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2002: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2001: ¥2,700,000 (Direct Cost: ¥2,700,000)
A report has been presented to report findings obtained from the research supported by the Grant-in-Aid.
The report first introduces the results of compression tests of light-gauge lipped channel short columns with plate thickness equal to about 1.0 mm that has been carried out to clarify the fundamental behavior of ultra thin-walled compression members failing in the local and distortional buckling, and then the method of numerical analysis based on the yield line theory is thoroughly explained. The research findings are as follows : i) Local buckling strength of a plate is affected by not only width-thickness ratio but also the behavior of adjacent plates. Especially, flange strength is strongly affected by lip length. ii) Failure behavior due to distortional buckling observed in the tests is well explained by the analysis based on the yield line theory using a mathematical model in which the lip is treated as a part of the flange, and the experimental maximum strength is also well es
timated by the yield line analysis.
Secondly, the report shows the results of negative bending tests of beams consisting of two lipped-channels, and the possible stiffness and strength evaluation methods, and then discusses stiffness, strength, and failure mode, comparing the results of tests and analysis. The research findings are as follows : i) Three kinds of buckling, local buckling, flange distortional buckling and web distortional buckling, occur in a specimen, and their deformations grows affecting each other, but the deformation of flange distortional buckling becomes predominant in the specimens with shorter lateral support interval, while that of web becomes predominant in the specimens with longer lateral support interval. ii) Distortional buckling strength tends to become smaller, as the height of the lipped channel becomes taller, and the lateral support interval becomes longer. iii) The buckling strength obtained by the analysis considering the effect of distortional buckling based on the finite strip method agrees well the experimental results. Less