Abstract
Cold-formed thin-walled steel members with a thickness of around 1 mm have been used as structural members for residential houses since 1990s in Japan. The application of the members to the houses requiring fire resistance has been limited, however, due mainly to a lack of information on mechanical properties and buckling behavior of such a thin steel member under elevated temperatures. In this research, therefore, material tensile tests and compression column tests were conducted to clarify the characteristics and to examine if existing column design formulae for normal temperature can be applicable. The tests covered a thickness from 0.5mm to 1.6mm and a temperature up to 600℃. It was reported in this paper that much difference is not observed on yield strength and young's modulus degradations up to 400℃ from traditional thicker building members, and existing column design formulae for normal temperature may be applied to estimate the column strength of thinwalled steel members under high temperatures.
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