Applicability of new bolt-type piezoelectric bolt sensor to estimate dynamic properties of bridges is verified by comparing measurement results with those obtained from ambient vibration observations and from finite element method of analysis. For this study a bridge located at Yurihonjo city, Japan, was chosen as the target structure. The structure is a multiple-span type bridge with steel beams of variable sections and reinforced concrete slabs to support the asphalt carpet. The bridge consists of seven spans with a total length of 256 m. The experimental measurements using the new bolt-type sensor were performed only on the first span near the left abutment. However, ambient vibration measurements and analysis were done for all spans. In general, responses were obtained appropriately using the new sensor and that results are comparable with those obtained from analysis and ambient vibration measurements.
ambient vibration, finite element method, natural frequency of vibration, piezoelectric bolt sensor.
 Ministry of Land, Infrastructure and Transport, Report on ‘Research on upgrading of soundness evaluation method for highway PC bridges’, Technical Notes of the National Institute for Land and Infrastructure Management, No. 623, 2010, pp. 6–14 (in Japanese).
 Shimbun, A., “The Ministry of Land, Infrastructure and Transport announced that 121 bridges are in risk of collapse”, newspaper article, Asahi Newspaper, November 4, 2009 (in Japanese).
 Kurosaki, S., Sasaki, Y. & Izumi, S., Trial of measurements for axial force of bolt using piezo cable. Journal of the Japanese Society for Non-Destructive Inspection, 56(3), pp. 149–154, 2007 (in Japanese).
 Nitta, Y., Imamoto, K. & Nishitani, A., Structural health monitoring using piezoelectric cable, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan, B-2, Structures II, Structural Dynamics Nuclear Power Plants, 2006, pp. 891–892 (in Japanese).
 Tokyo Sensor Co., Ltd, P “Product Information: Piezoelectric cable, Traffic Sensors”, Product catalog 2010, pp. 16–17 (in Japanese).
 Tokyo Sensor Co., Ltd, “Piezo Film Technical Manual”, user manual, V1.0, R1, 2001, pp. 17–18 (in Japanese).
 Chang, F.-K., The demands and challenges. Proceedings of the 3rd International Workshop on Structural Health Monitoring, Stanford University: Stanford, CA, pp. 1–8, 2001.
 Nakamura, M. & Yasui, Y., Damage evaluation of a steel structure subjected to strong earthquake motion based on ambient vibration measurements, Journal of Structural and Construction Engineering – Transactions of AIJ, 517, pp. 61–68, 1999 (in Japanese).
 Okabayashi, T., Okumatsu, T. & Nakamiya, Y., Experimental study of structural damage detection using the high accurate structural vibration-estimation system. Journal of Structural Engineering A, 51A, pp. 479–490, 2005 (in Japanese).
 Shimoi, N., Cuadra, C. H., Madokoro, H. & Saijo, M., Simple smart piezoelectric bolt sensor for structural monitoring of bridges. International Journal of Instrumentation Science, 1(5), pp.78–83, 2012. http://dx.doi.org/10.5923/j.instrument.20120105.03
 Nakamura, M., Development of structural health monitoring system, Measurement and Control, 41(11), pp. 819–824, 2002 (in Japanese).