Hongtang Bridge Expansion Joint Monitoring

Challenge

Hongtang Bridge crosses the South Channel of the Min River in Fuzhou. As a major highway bridge on National Highway 316, with a design speed of 60 km/h and roadway width of 47.5 m, monitoring thermal expansion at expansion joints is critical for structural integrity assessment and maintenance planning.

Solution

Applied advanced phase unwrapping combined with Mixed Total Least Squares method for precise InSAR deformation monitoring of expansion joints. This approach enables detection of subtle thermal expansion patterns that traditional monitoring methods cannot capture.

Result

Successfully identified thermal expansion characteristics at expansion joints with maximum thermal expansion coefficient reaching 0.6 mm/°C. The monitoring clearly distinguished between expansion deformation (blue) and contraction deformation (green), providing actionable maintenance insights.

Scientific Results

Figure 1: Thermal expansion coefficient map of Hongtang Bridge overlaid on satellite imagery. Color-coded points indicate expansion (blue) and contraction (green) deformation at expansion joints, with maximum thermal expansion coefficient reaching 0.6 mm/°C.

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