コンクリート充てん角形鋼管柱の耐火性能に関する実験的研究 : 定軸力下における加熱時挙動について

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Steel structures have many advantages, but also have the following drawbacks in addition to corrosion : 1) Liability to buckle, 2) lower elastic rigidity and 3) liability to be deteriorated by high-temperature heating. One of the effective measure to improve these drawbacks is the concrete-stiffening of steel structural members. This report has investigated the development of the concrete-filled square steel pipe structures for this purpose, particularly the fire resistance of such columns. Filled concrete is effective in achieving excellent fire resistance in the following two points : (1) When fire resistance is evaluated by the steel pipe temperature, the heat capacity of filled concrete contributes to the suppression of a temperature rise of the steel pipe and (2) When fire resistance is evaluated by the collapse of the member load burden transfer to filled concrete can be expected to cope with the lowering of steel pipe strength due to high-temperature heating in fire. This report clarifies mainly the basic behavior of concrete-filled steel pipe for the latter case. Tests performed include the following two kinds : (1) A heating test under constant load by a loading equipment which has made it possible to detect axial force transfer from the steel pipe to the filled concrete, (2) a heating test under constant load applied on beam-to-column connection, assuming the actual flow of force. Through these tests, information about the transfer characteristics of axial force from the steel pipe to the filled concrete as well as the deformation characteristics and local buckling behavior of steel-pipe columns have been obtained and it has been confirmed that the load bearing capacity against a standard fire heating can be maintained for more than two hours when the applied load is 20% of the axial yield strength of the steel pipe and for more than one hour when the applied load is 40% of the axial strength. The flexural strength of columns after cooling has sufficiently exceeded the design load corresponding to seismic load that may occur after the fire.
社団法人日本建築学会の論文
1985-04-30

コンクリート充てん角形鋼管柱の耐火性能に関する実験的研究 : 定軸力下における加熱時挙動について

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