Deterioration diagnosis of wooden bridges by nondestructive testing method (I)-an investigation of the ultrasonic propagation method-

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  • 非破壊試験法による木橋の劣化診断（その１）―超音波伝播法の試み―
  • ヒハカイ シケンホウ ニ ヨル モッキョウ ノ レッカ シンダン ソノ 1 チョウオンパ デンパホウ ノ ココロミ
  • an investigation of the ultrasonic propagation method
  • 超音波伝播法の試み

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Abstract

Ultrasonic propagation velocity across wood fiber direction was measured in wooden bridges in order to investigate the possibility of nondestructive deterioration diagnosis of wooden bridges. The measurements were carried out for three different types of wooden bridges. The periodical measurement was also made for one of them to investigate its secular change. The results were:<BR>(1) The histograms of ultrasonic propagation velocity could show the total deterioration states ofthe wooden bridges. The histograms reflect the deterioration of three different types of wooden bridges.<BR>(2) Cumulative probability curves of ultrasonic propagation velocity were effective to monitor time-dependent change of the deterioration of wooden bridge.

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