Monitoring of Hakucho Suspension Bridge by ambient vibration measurement

Masato Abe; Yozo Fujino; Mihiro Yanagihara; Masashi Sato

doi:10.1117/12.387815

9 June 2000 Monitoring of Hakucho Suspension Bridge by ambient vibration measurement

Masato Abe, Yozo Fujino, Mihiro Yanagihara, Masashi Sato

Proceedings Volume 3995, Nondestructive Evaluation of Highways, Utilities, and Pipelines IV; (2000) https://doi.org/10.1117/12.387815
Event: SPIE's 5th Annual International Symposium on Nondestructive Evaluation and Health Monitoring of Aging Infrastructure, 2000, Newport Beach, CA, United States

Abstract

Monitoring of a 720 m span suspension bridge which is located at windy and seismically active area in northern part of Japan, opened in 1998 is introduced. The purpose of the monitoring is to understand the actual dynamic behavior and loading conditions, and to develop a health monitoring scheme using ambient vibration measurement which is readily available under service conditions. Data processing scheme based on Ibrahim's time domain method is constructed for identification of natural frequencies, mode shapes and modal damping ratios. Because measurement of the input force is not available for ambient vibration measurement, statistical treatment of measured data is required to obtain reliable results. This scheme is applied to analyze the actual ambient vibration measurement of the bridge under various environmental conditions. In the analysis, amplitude dependent softening of bearing supports which is not expected at the design calculation is identified. This preliminary analysis shows that the current monitoring system is directly applicable for identification of damage at the bearing supports which is one of the hot spots for fatigue and seismic damage, and also has the potential applicability to the health monitoring of the entire bridge.

Citation Download Citation

Masato Abe, Yozo Fujino, Mihiro Yanagihara, and Masashi Sato "Monitoring of Hakucho Suspension Bridge by ambient vibration measurement", Proc. SPIE 3995, Nondestructive Evaluation of Highways, Utilities, and Pipelines IV, (9 June 2000); https://doi.org/10.1117/12.387815

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