Structural health monitoring works, which measure key structural parameters systematically, provide valuable information in current evaluation of structural integrity, durability and reliability. The application of new structural concept In design and construction of three cable-supported bridges in Tsing Ma Control Area (TMCA) of Hong Kong and complexity and size of cable-supported bridges have called for implementation of such monitoring works to ensure cost optimal maintenance planning and safe bridge operation. A bridge monitoring system has therefore been deployed and implemented in monitormg and evaluating the structural health of these bridges, i.e. Tsing Ma (suspension) Bridge, Kap Shui Mun (cable-stayed) Bridge and Ting Kau (cable-stayed) Bridge. This system is named as Wind And Structural HealthMonitoring System (WASHMS) and is composed of five sub-systems, namely, Sensory Systems, Data Acquisition Systems, Data Processing and Analysis Systems, Computer Systems, and Cabling Network Systems. This paper outlines: (i) objectives and scope of monitoring, (ii) identification of key structural monitoring parameters, (iii) types of sensory systems required, (iv) global layout design ofWASHMS, (v) development ofWASHMS, and (vi) implementation of WASHMS.

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A structural health monitoring system has been installed in the cable-supported bridges located in the West of Hong Kong, i.e. the Tsing Ma Control Area. These cable-supported bridges are the Tsing Ma (Suspension) Bridge, the Kap Shui Mun (Cable-Stayed) Bridge and the Ting Kau (Cable-Stayed Bridge) Bridge. The monitoring system of Tsing Ma Bridge and Kap Shui Mun Bridge has been operated since May 1997, whereas the monitoring system ofTing Kau Bridge has been operated since November 1998. In past years, data received from the monitoring systems have been processed, and analyzed and archived. This paper first briefly outlines the operation of the data processing and analysis, and then presents: (1) the load effects monitoring results such as wind, temperature and traffic (highway and railway), and (2) the bridge responses monitoring results such as displacements, stresses/strains, accelerations and cables forces. Comparisons between monitoring results and design parameters and assumptions for the cable-supported bridges are also presented.