DYNAMIC RESPONSE ANALYSIS OF BOX SECTION STEEL FRAMES CONSIDERING LOCAL BUCKLING

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  • KODAMA Noriko
    社団法人 土木学会 早稲田大学 理工学部土木工学科
  • YODA Teruhiko
    社団法人 土木学会 早稲田大学 理工学部土木工学科

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  • 局部座屈の影響を考慮した箱形断面鋼製橋脚の地震時動的応答解析
  • キョクブザクツ ノ エイキョウ オ コウリョ シタ ハコガタ ダンメン コウセイ キョウキャク ノ ジシンジ ドウテキ オウトウ カイセキ

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Abstract

A dynamic response analysis method for evaluation of the maximum and residual displacements of steel piers or frames with box sections is proposed. A “plastic deteriorating hinge” is defined as a deteriorating area in the stiffened plates, which is due to local buckling. The buckling stress, the softening stress-strain relation and the decrease in unloading stiffness of a plastic deteriorating hinge are formulated from FEM studies with shell elements, and they are implemented in the stress-strain relation of a beam element.<br>The maximum and residual displacements of steel frames are successfully predicted by finite displacement analyses with such beams, which can be used for evaluation of seismic performance of existing steel frames.

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