APPLICATION OF A PHASED ARRAY EQUIPMENT APPLIED SYNTHESIS APERTURE FOCUSING TECHNIQUE FOR FATIGUE CRACKS OCCURRED FROM ROOT OF RIB-TO-DECK WELDS IN ORTHOTROPIC STEEL BRIDGES
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- HIRAYAMA Shigeyuki
- (一財)首都高速道路技術センター 構造技術研究所
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- KATO Shunta
- (一財)首都高速道路技術センター 構造技術研究所
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- MURANO Masumi
- (一財)首都高速道路技術センター 構造技術研究所
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- KARASAWA Hirokazu
- 東芝検査ソリューションズ(株) 検査装置部
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- KODAMA Tomonari
- 東芝検査ソリューションズ(株) 検査装置部
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- SHIRAHATA Hiromi
- 東京都市大学 建築都市デザイン学部 都市工学科
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- NAGAI Masanobu
- 首都高速道路(株) 東京西局 土木保全設計課
Bibliographic Information
- Other Title
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- 鋼床版デッキプレート・Uリブ溶接部に発生する疲労き裂に対する開口合成PAの適用
Abstract
<p> In recent years, many fatigue cracks propagating from the weld root of trough rib-to-deck welds have been detected in orthotropic steel bridges. These cracks are occurred from the root of rib-to-deck welds, and thus cannot be detected using visual inspection. Non-detective testing can effectively detect these cracks. Especially, ultrasonic testing is the most reliable non-destructive method for these cracks. Various ultrasonic testing equipment has been developed so far, but it is difficult to detect small cracks. It is necessary to detect these cracks at the early stage of its propagation. A phased array ultrasonic equipment applied synthesis aperture focusing technique has been developed in order to detect internal cracks. In this study, to confirm the crack detection accuracy of the developed equipment, crack investigations using the equipment were carried out using specimens with fatigue cracks induced by experiments. Crack detection accuracy is evaluated by comparing with real cracks induced in specimens.</p>
Journal
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- Infrastructure Maintenance Practices
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Infrastructure Maintenance Practices 3 (1), 265-272, 2024
Japan Society of Civil Engineers
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Details 詳細情報について
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- CRID
- 1390862268802284032
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- ISSN
- 2436777X
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- Text Lang
- ja
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- Data Source
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- JaLC
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- Abstract License Flag
- Allowed