ANALYSIS OF THE STEEL BRACE MEMBER SUBJECTED TO REPEATED PRESCRIBED AXIAL DISPLACEMENT : (Part 1) Formulation of the elasto-plastic finite deformation analysis method considering the influence of the loading history

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  • 繰り返し強制軸方向変位を受けるブレース材の解析 : その1 外乱載荷履歴の影響を考慮した弾塑性有限変形解析手法の定式化
  • クリカエシ キョウセイジク ホウコウ ヘンイ オ ウケル ブレースザイ ノ カイセキ ソノ 1 ガイランサイカ リレキ ノ エイキョウ オ コウリョ シタ ダン ソセイ ユウゲン ヘンケイ カイセキ シュホウ ノ テイシキカ

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Abstract

In the authors' previous papers""31, effective methods to investigate elasto-plastic behavior of the steel structures subjected to repeated and variable loads, which are called as "critical response analysis method" and "residual stress, residual deformation analysis method", were proposed. Critical response analysis method, in which the relations between "critical loads" and "critical responses" are simultaneously obtained, is readily applied to the finite deformation problem. In this paper, in order to consider the constant amplitude loads, critical response analysis method is modified for the loads repeated along the prescribed loading path, and its formulation for the steel frame structure is presented. It is shown that the required modification of the present approach to the ordinary is to prescribe the loading path which traces the circumference of the constant magnitude domain and consider another "updated load domain" extended along the loading path. In order to verify the validity of the present method, elasto-plastic finite deformation analyses of the steel brace member subjected to repeated prescribed axial displacement are carried out, and are compared with those of the step-by-step method. Also, the influence of the loading history on the behavior of the steel brace member is discussed by comparing the results of present and ordinary critical response analysis methods.

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