| Project/Area Number |
24560587
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Structural engineering/Earthquake engineering/Maintenance management engineering
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| Research Institution | Tokyo City University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
KISHI Toshiharu 東京大学, 生産技術研究所, 教授 (90251339)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2014: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2013: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | 橋梁 / 腐食 / 界面 / 鋼 / コンクリート / 非破壊検査 / 鋼・コンクリート界面 / 超音波探傷 / 赤外線サーモグラフィ / 超音波探傷試験 |
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| Outline of Final Research Achievements |
Deterioration of civil infrastructure is getting one of the most serious problems, recently. A diagonal member of a steel truss bridge was cut off due to the corrosion in the 2000s. The truss member was embedded in the reinforced concrete floor systems. The structural detail was not appropriate in terms of water drain. This study aims at developing nondestructive technique that detects the corrosion. Among nondestructive methods, thermography and ultrasonic test were applied. Detachment and water puddle in the interface between concrete floor and steel diagonal member was detected by the thermography. Temperature rate of the interface decreased more slowly, when water exists in the interface. Ultrasonic test was also applied to detect the detachment and thickness reduction by the corrosion. Some ultrasonic techniques such as SV (vertical shear) wave, SH (horizontal shear) wave, and Rayleigh (surface) wave methods. SV wave showed good detection ability among those methods.
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