THREE DIMENSIONAL ANALYSIS OF DEFLECTION BEHAVIOUR ABOUT STEEL FRAMES EXPOSED TO FIRE

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  • LI Yuguang
    Grad. School of Science and Technology, Tokyo Univ. of Science
  • UESUGI Hideki
    Grad. School of Science and Technology, Chiba Univ.
  • WAKAMATSU Takao
    Grad. School of Science and Technology, Tokyo Univ. of Science

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  • 火災加熱を受ける鉄骨立体骨組の応力変形解析
  • カサイ カネツ オ ウケル テッコツ リッタイ ホネグミ ノ オウリョク ヘンケイ カイセキ

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Abstract

It is natural to treat a building structure as a three-dimensional body when considering its behaviour in a fire, because fire is a phenomenon involving three-dimensional thermal expansion. This study takes further our proposal of an analytical method involving the unitary division of structure as an approach to the problem of the increase in the number of nodes which occurs in the three-dimensional analysis of a building frame. The study presents a three-dimensional thermal stress analytical method which takes account of the thermal expansion of a floor slab exposed to fire by conceiving the floor slab as a grid of intersecting beams. The theoretical results agree well with those recorded in experiments in which a full scale frame was exposed to vehicle fire.

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