塑性設計された鋼構造骨組の弾塑性クリープ熱変形挙動

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In order to get information about thermal deformation behavior of steel frames for the fire safety design, 7-story plastic designed frames are investigated numerically under a uniformly distributed temperature history of heated members. After some improvements to include the mechanical model of steel at high temperature and the condensation technique to perform the big frame simulation economically, the method of finite element elasto-plastic creep analysis in Ref. 4) is used for calculation of eighteen frame examples. Summarizing the results of analysis ; (1) The heated beam members whose sectional dimensions are decided for only the gravity load condition at the room temperature, begin to deflect large at about 550℃, and some of them collapse. (2) The heated inside column members in a 3-span frame which are designed for only the gravity load begin to collapse as a single member at about 540℃, therefore they have a tendency to cause the global frame collapse at high temperature. (3) In the case of the aseismic designed frames except for the 7th story, the large deflection due to the gravity load is not observed. But the heads of outside columns in the 3-span frames are pushed laterally about 7 cm due to the thermal elongation of heated beams, and outside beam members are deformed anti-symmetrically by the moment force of other members. And the increase of column strength makes the axial force and the deflection of heated beams become larger.
社団法人日本建築学会の論文
1986-10-30

塑性設計された鋼構造骨組の弾塑性クリープ熱変形挙動

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