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Reduction of Stress Concentration at Stop-Hole by Bolting a Crack

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Abstract

A stop-hole, which is drilling at the crack tip, is one of the famous tentative repairs of fatigue cracks in steel structures. When the crack becomes longer, the stress concentration of the stop-hole also increases. Therefore, during the tentative repair of long fatigue cracks, the chances for re-initiation of the fatigue cracks from the stop holes are high. The bolting stop-hole method is a useful technique against fatigue cracks. In this technique, bolting is applied only for the stop-holes at the crack tips. Therefore, as the crack length increases, the effect of the bolting stop-hole method decreases. In this paper, the authors propose a stress concentration reduction technique for a stop-hole by bolting the fatigue crack between stop-holes. The effect of the proposed technique was verified by tensile and bending tests of specimens as well as finite element analysis. From the tensile and bending tests, it was clarified that the stress concentration of the stop-hole was drastically reduced by bolting a crack under the condition before the slippage of bolts. Additionally, multi-bolting cracks have the advantage of improving the slippage load of the bolts in a crack. Furthermore, finite element analysis verified the reduction in stress concentration of the stop-hole by bolting a crack, and the effectiveness of bolting cracks and stop-holes was also shown.

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Authors and Affiliations

  1. Department of Civil, Environmental, and Applied Systems Engineering, Kansai University, 3-3-35 Suita-shi Yamate-cho, Osaka, 564-8680, Japan

    Toshiyuki Ishikawa

  2. Technical Proposal Division, Yokogawa Bridge Holdings Corp., Chiba, Japan

    Shogo Kiyokawa

  3. Technical Proposal Division, Yokogawa Bridge Corp., Tokyo, Japan

    Wataru Nakatsuji

Authors
  1. Toshiyuki Ishikawa
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  2. Shogo Kiyokawa
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  3. Wataru Nakatsuji
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Correspondence to Toshiyuki Ishikawa.

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Ishikawa, T., Kiyokawa, S. & Nakatsuji, W. Reduction of Stress Concentration at Stop-Hole by Bolting a Crack. Int J Steel Struct 20, 2076–2085 (2020). https://doi.org/10.1007/s13296-020-00434-1

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  • DOI: https://doi.org/10.1007/s13296-020-00434-1

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