Zhanjiang Bay Bridge, located in Guangdong province, China, is composed of an 840 meter long cable-stayed bridge and 3,141 meter long approach viaducts (Fig. 44). The longest bridge in Guangdong province was opened to public on December, 2006. The cable-stayed bridge consists of 480 meter long main span, two 120 meter interior spans, and two 60 meter exterior spans. Two different types of girder are used in the cable-stayed bridge. The 720 meter interior spans are steel box girder, and the 120 meter exterior spans are pre-stressed concrete box girder. The out-to-out box girder is 28.5 meter and the height of the box is 3 meter. It carries two 6-meter lanes on each direction to east and west bound. A-shaped pylons made of reinforced concrete are 155 meter high.
IIS is working in collaboration with the Chinese Railroad Bridge Institute to design a distributed Intelligent Bridge Monitoring System for the Zhanjiang Bay Bridge.
The Kishwaukee River Bridges, located in about 4 miles south of Rockford, Illinois, are twin post-tensioned segmental concrete box girder bridges, constructed using a balanced cantilever technique. The 5 span 1090 foot long bridges with 250-foot interior spans and 170-foot end spans are opened in 1980. Each box girder carries two 12-foot lanes and shoulder of 10 and 6 feet. The out-to-out width of the box girder is 41 feet, and the heights of the box at pier and mid section are 18 and 8 inches respectively.
Local strains and displacements were measured on the inside and outside of the webs, the presence and extent of crack growth and state of shear reinforcement in webs were observed. FEM model updating for global monitoring was performed. Static load test was performed on the bridge in 2000, mid-span deflection, axial strains in web closures; average strains and crack opening in webs were recorded. Shear stress/strain analysis was performed.A customized user-friendly remote web-based Bridge Monitoring System (BMS) to access to real time data was developed. The BMS is a combination of sensor integration, warning and alarm system, statistical analysis and expert system. The BMS provides a password-protected access to the known users. An automated monitoring system for the bridge has been deployed since December 2001. The system provides critical information on strains, displacements, accelerations and temperature at the key segments. A multi-year system maintenance and data analysis program was considered for the bridge for identification of an effective retrofit design.