STUDY ON ULTIMATE STRENGTH OF COMPOSITE BEAM WITH ENDS RESTRAINED AGAINST ROTATION IN FIRE

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  • YASUDA Satoshi
    Senior Research Engineer, Technology Center, Taisei Corporation, M. Eng.
  • MICHIKOSHI Shintaro
    Senior Research Engineer, Technology Center, Taisei Corporation, Dr. Eng.
  • TAGAWA Yasuhisa
    Prof., Graduate School of Engineering, Yokohama National University, Dr. Eng.

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  • 火災時における端部の回転を拘束した合成梁の終局耐力に関する研究
  • カサイジ ニ オケル タンブ ノ カイテン オ コウソク シタ ゴウセイリョウ ノ シュウキョク タイリョク ニ カンスル ケンキュウ

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Abstract

The paper is intended to summarize findings from fire resistance tests on composite beams with ends restrained against rotation. The specimens were comprised of H-shaped steel beam and overlying composite slab with profiled steel decks, with studs at the interface. A total of four models were tested. The test parameters included the level of load. Based on the test results, a new formulation is proposed to calculate with a good accuracy, the flexural strength under positive moment on the basis of the plastic theory taking account of the heat-induced degradation of steel / concrete materials and shear capacity of studs in the positive moment area, and the local buckling strength under negative moment on the basis of the models taking account of the post-peak strength behaviors which were obtained from stub-column tests.

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