Abstract
We introduced a new fixed structure supporting offshore wind turbines on the Donghai Bridge wind farm in the East China Sea. It is a high-rise pile cap foundation with a cap supported by eight steel piles penetrating soil. This foundationserves as an in-situ test model for a new structure to support offshore wind turbines. To monitor the behavior of thenew structure, stress/strain monitoring instruments were installed on four steel piles and in the cap; clinometers were also installed to monitor tilt angles. This instrumentation allows in-situ measurements of the wind speed and direction as well as measurements of the stresses on the piles and cap and the inclination of the tower. From these measurements, the impact of the waves and wind on the tower stress was characterized, as was the relationship between the wind conditions and tower inclination. Additionally, the behavior of the new structure during typhoon Haikui was captured.
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