AXIAL COMPRESSION BEHAVIOR AND STRENGTH EVALUATION OF NATURALLY CORRODED CHANNEL AND ANGLE STEEL MEMBERS
Kazumasa HISAZUMI, Ryoichi KANNO, Tomonori TOMINAGA, Kenichiro IMAFUKU, Katashi FUJII
As aging steel structures increase, it becomes more important to evaluate the residual strengths of the structures in a quantitative manner. In this paper, axial compressive strength of corroded channel and angle steel members obtained from truss structures that were used for about 40 years was extensively studied with experiments and numerical analyses. They showed that the members had quite complex behavior such as local buckling, global flexural buckling, yielding and their combined failure modes. It was also shown that the local failure became more critical for the members where the maximum sectional area loss was more than 40% to the original section, whereas where the loss was less than 40%, the strength seemed to be controlled by global buckling and yielding. Reasonably accurate strength formulae that can be used directly for design were proposed based primarily on conventional global flexural buckling strength formula with some modification factors. The accuracy and applicability of the formulae were also verified through FEM analyses.
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