• Title/Summary/Keyword: 극저사이클 재하

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Tests on Failure of Steel Angles due to Very Low-Cycle Fatigue of Loading (극저사이클 재하하에서 앵글 강부재의 파괴실험)

  • Park, Yeon Soo;Kim, Sung Chil;Lim, Jung Soon
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.12 no.4_1
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    • pp.23-32
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    • 1992
  • The objective of this study is to identify the quantitative relationships among the important physical factors associated with failure of steel members under strong seismic excitations through very low-cycle fatigue tests. Very low-cycle fatigue is meant to be structural fatigue causing cracks and rupture in about 5~30 cycle ranges. The angle specimen was subjected to repeated axial Ioad after undergoing inelastic buckling. The test results reveal that the energy absorption capacities vary heavily with the history of loading and the failure mode. The maximum values of residual local strain at the initiation of a visible crack due to the very low-cycle fatigue were of the order of 25~40%, regardless of loading patterns, deflection modes, and width-to-thickness ratios.

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A Study on Plastic Fatigue of Structural Steel Elements under Cyclic Loading (반복하중을 받는 강구조 요소의 소성피로에 관한 연구)

  • Park, Yeon Soo;Park, Sun Joon;Kang, Sung Hoo;Yoon, Young Phil
    • Journal of Korean Society of Steel Construction
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    • v.9 no.2 s.31
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    • pp.193-204
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    • 1997
  • In order to quantify the relationships of the important physical factors relating failure to strong earthquake loading, the plastic fatigue problems for structural components under repeated loading were reviewed first. A new concept of very low cycle fatigue failure for structural components under severe cyclic excitations as in strong earthquakes was represented. Also, an experimental study was made of the very low cycle fatigue failure of structural steel elements. It was attempted to realize the ultimate failure in the course of loading repetitions of the order of several to twenty. The test specimen had a form of rectangular plate, representing a thin-plated element in a steel member as wide-flange cross section. It was subjected to uniaxial loading repeatedly, until complete failure takes place after undergoing inelastic buckling, plastic elongation and/or their combination. It was seen as a result that the state of the ultimate failure is closely related to the maximum strain at the extreme fiber in the cross section.

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