‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ μθ»SZρ KAWASAKI STEEL GIHO Vol.6 (1974) No.1 ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
χnCubhEK[_[ΜζJxΙΦ·ι€ Study on the Fatigue Strength of Thin-walled Hybrid Plate Girders Oc@KY(Yukio Maeda)@Ξn@³v(Masao Ishiwata)@μδ@@L(Yutaka Kawai) |
v| : nCubh Μζκ³Ι¨ζΪ·ΕεΝCΝUC ΒΧ·δC ½βήxΜeΏπ²Χι½ίCψ£tWΙ80kg/mm2Ε£Ν|C³ktW60kg/mm2£Ν|C ΒΙΚ|πgp΅½ε^± U{πp’ΔΘ°ζJ±πsΘΑ½BΎηκ½±ΚΝTopracΜͺήΙ]ΑΔζJTτΜ^π’·ιΖΖΰΙCnCubh ΜS-NΘόΙΒ’ΔωΜ€ΚΖΜδrπsΘΑ½B»ΜΚCζJjσΝΌβή| ΒΜ·έχnΪΙΆΆ½ζJTτ©ηN±ι±ΖC200ρΜJθΤ΅ΙΞ·ιζJxΝΝSUΕ12.9kg/mm2Ε θC±κΝ80kg/mm2£Ν|ΜPκ|ν ΙδΧΩΪ―ΜxπΰΒ±Ζͺν©Α½Bά½Cε^± ΜζJ±ΚΝCu\`OΚ·έχnΪpθΜ¬^±ΚΖΗ’Φπ¦·±Ζͺν©Α½B |
Synopsis : An experimental study on thin-welled hybrid plate girders subjected to repeated loading is summarized. Six large-sized hybrid plate girders fabricated with 80 kg/mm2 class high strength steel (quenched and tempered) at a tension flange, SM-58 at a compression flange and SS-41 at a web are tested under repeated bending. Parameters investigated in this study are maximum stress, stress range, web slenderness ratio and rigidity ratio of longitudinal stiffener. Test results are discussed on the observed fatigue crack patterns according to the classification proposed by Toprac, and S-N curves for hybrid girders are developed and compared with several previous research data. Consequently, it is proved that the fatigue failures can be evaluated well from the crack at the transverse stiffener-to-web fillet weld below the neutral axis and fatigue strength at 2~10 6 cycles of these girders is 12.9kg/mm2 in stress range which is nearly equal in strength to homogeneous girders consisting of 80kg/mm2 class high strength steel. Moreover, a good correlation is observed in the fatigue test results between model specimens with transverse fillet welded attachments and large-sized girder specimens. |
{ΆiPDF: 17P/626kbj |