Online Deflection Monitoring System for Dafosi Cable-Stayed Bridge

Abstract

A health monitoring system was designed and installed on Dafosi Bridge, the largest cable-stayed bridge across the Yangtze River in western China. This article briefly describes an online deflection monitoring system, the most important sensing subsystem of the health monitoring system. It can be divided into two major components, one for measurement, and one for control and data processing. The measurement system itself includes two types of deflection sensors to monitor the lateral displacement of the two towers and the flexural and torsional displacement of the main girder. Sensor outputs are pre-processed locally and sent to the host computer at the management center via the Internet. The system design and implementation are reviewed, and the results of data from two kinds of sensors are presented.

Keywords

cable-stayed bridge health monitoring deflection deflectometer opto-electronic sensor on-line

Get full access to this article

View all access options for this article.

References

Haifan, Xiang 2000. “Health Monitoring Status of Long-span Bridges in China,” In: Proceedings of the Workshop on Research and Monitoring of Long Span Bridges, Hong Kong, April 2000, pp. 24-31 .

Rixu, Xu , Fuyi, Wang and Jiaku, Zhao 1992. Measurement of Bridges, People’s Communication Press (in Chinese), Beijing .

Tang, M. C. 1994. “The 40-Year Evolution of Cable-Stayed Bridges,” In: Yuanpei, Lin et al. (eds), The 1994 International Symposium on Cable-Stayed Bridges, Shanghai, pp. 30-41 .

Walther, R. , Houriet, B. , Lesler, W. and Moia, P. 1988. Cable-stayed Bridges, Thomas Telford, London .

Weimin, Chen , Yumei, Fu and Yong, Zhu 2000. “Inline Sensing System for Multi-parameter Remote Measurement of Bridges,” In: Proceedings of the Workshop on Research and Monitoring of Long Span Bridges, Hong Kong, April 2000, pp. 173-179 .

Yong, Zhu , Yumei, Fu and Liu, N. D. 2000. “High Dynamic Multi-channel Laser Deflectometer for Bridges,” In: Workshop on Research and Monitoring of Long Span Bridges, Hong Kong, April 2000, pp. 86-91 .

Zhu, Yong , Fu, Yumei and Chen, Weimin 2003. “Health Monitoring System for Dafosi Cable-stayed Bridge,” In: Smart Structures and Materials 2003: Smart Systems and Nondestructive Evaluation for Civil Infrastructures, Proceedings of SPIE, Vol. 5057, pp. 289-297 .