STUDY ON CREEP STRAIN OF CONCRETE UNDER THE VARIOUS STRESS HISTORIES

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  • 変動応力下におけるコンクリートのクリープの予測に関する研究
  • 変動応力下におけるコンクリートのクリープ予測に関する研究
  • ヘンドウ オウリョクカ ニ オケル コンクリート ノ クリープ ヨソク ニ カ

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Abstract

Most of widely-used creep analysis methods of concrete are on the basis of principle of superposition, and the creep coefficient used in the analysis is constant irrespective of subjected stress. Hence, the non-linear phenomena of creep are frequently neglected in the actual design. We clarify that the creep strain of concrete under the various stress histories is non-linear phenomena strongly affected by the maximum stress. When we treat creep as non-linear phenomena, we need creep hardening rule to calculate the creep strain under the changing stress. Many creep hardening rules have already proposed. For example, there are strain hardening rule, time hardening rule, work hardening rule and so on. These creep hardening rules are proposed for metal materials not for concrete. We will propose the creep hardening rule which can be applied to creep problem of concrete under any condition.

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