Fatigue Damage Assessment of Piping Systems having Wall Thinning under Seismic Loadby Parametric Numerical Analysis

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  • <b>地震荷重下における減肉配管系の</b><b>パラメトリック数値解析による疲労損傷評価 </b>
  • 地震荷重下における減肉配管系のパラメトリック数値解析による疲労損傷評価
  • ジシン カジュウ カ ニ オケル ゲンニク ハイカンケイ ノ パラメトリック スウチ カイセキ ニ ヨル ヒロウ ソンショウ ヒョウカ

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Abstract

<p>This study presents parametric analysis for fatigue assessment and dynamic responses of three-dimensional wallthinned piping systems subjected to seismic loadings. Validated finite element models were constructed based on the wallthinned piping system reported in the previous paper. Fatigue lives for in-plane and out-of-plane bending modes are assessed with the effect of ratchet deformations. The obtained results are summarized as follows:(i) Stiffness of piping and number of strain cycles decrease with the increase in the fraction of wall thinning, (ii) Internal pressure affects the increase in ratchet strain and the fatigue lives decrease, (iii) The fatigue life of local wall thinning is not always safe compared with full circumferential thinning.</p>

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