鋼構造立体剛接骨組の過荷重時臨界挙動の解析

概要

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Safety for abnormal vertical loads of structure is guaranteed by a load coefficient in a simple plastic theory now. However, behavior after collapse in the theory is not yet well known. There is not in particular a report about behavior of spatial rigid frame subjected to overload at all. In this paper, the critical behavior of spatial rigid steel frame subjected to abnormal vertical load is analysed by use of elasto-plastic spatial beam-column FEM with the incrimental perturbation method. The onestory rectangular frame of pin base produces the sway movement after the plastic collase mechanism. Thereafter the frame shows two different deformation modes by a difference of the loading position. One is the gap deformation mode between the parallel plane of structure, and the other is the twist deformation mode of frame. On the other hand, fixed based frame slightly deteriorates after the plastic collase mechanism, but the frame shows relatively stable behavior.
一般社団法人日本建築学会の論文
2007-03-20