橋梁の活荷重応答計測に必要なS/N比に関する研究

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  • Study on the required S/N ratio for the bridge measurement under live load
  • キョウリョウ ノ カツカジュウ オウトウ ケイソク ニ ヒツヨウ ナ S/Nヒ ニ カンスル ケンキュウ

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The acceleration sensor may play an important role in health monitoring of civil engineering structure, because it is easy to install and a low purchase price. As the acceleration under live load at low frequency is small, it is important to know not only sensor self-noise but also the required signal-to-noise (S/N) ratio. In the present study, field measurement were first performed in order to compare the acceleration response between 9 different accelerometers under live load. The negative effects of sensor self-noise were then evaluated by the results of double-integration process. Finally, using a shaking table whose frequency and amplitude could be varied parametrically, S/N ratio required to accurately measure the response at low frequency range was estimated.

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