Tentative repair of fatigue crack in steel bridge by automatic center punch

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  • オートマチックセンターポンチによる鋼橋の疲労き裂の応急処置
  • オートマチックセンターポンチ ニ ヨル コウキョウ ノ ヒロウ キレツ ノ オウキュウ ショチ

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Abstract

<p>Impact crack closure retrofit (ICR) treatment has been proved to be effective to repair small cracks initiated from weld toe. High compressive residual stress induced by peening near the weld toe attributes to it. In this study simplified ICR treatment using an automatic center punch (ACP) with rounded tip is proposed. ACP is commercially available hand-tool, so that treatment can be carried out even during inspection. Compressive residual stress induced by ACP was about a half of that due to ICR treatment, yet fatigue tests showed that fatigue life was prolonged for cracked and as-welded specimens. Proposed technique was applied to fatigue crack at upper end of vertical stiffener, and stress measurements showed the similar effect as one due to ICR treatment.</p>

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