参照応力法による強制変位を受ける静定構造物の歪評価

概要

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It is well known that the inelastic strain accumulation of statically determinate structure subjected to forced displacement is caused by the elastic follow-up due to surrounding elastic region. The author once showed that the relaxation phenomenon of creeping structures during the elastic follow-up can be well estimated by the reference stress method. By applying this result, the author has proposed a simplified method to estimate the creep strain accumulated by the elastic follow-up. It has been shown that elastic follow-up factor can be calculated from the reference stress ratio, which is the ratio of Local Reference Stress and Global Reference Stress. The proposed method was applied to the elastic follow-up of 2-bar model and 2-beam model. For 2-beam model, a simple method has been proposed to estimate the stress-strain relation during the elastic follow-up, and it showed quite good agreement with FEM results. It was also shown that the proposed method can be applied to the plastic strain accumulation due to the elastic follow-up. By comparing with other strain estimation methods such as Neuber's method and Stress Relaxation Locus method, the proposed method was found to be reasonable and precise.
一般社団法人日本機械学会の論文
2008-04-25