Considering the issues of cracking and slurry leakage resulting from the fatigue damage of a wind turbine foundation with a foundation-ring under long-term wind loads
a three-dimensional calculation model of the wind turbine foundation was established using the midas FEA NX finite element software. This model was employed to simulate the response of the foundation under the measured wind load. The location of cracks and the stress level in critical areas of the wind turbine foundation were analyzed
thereby revealing the failure development process of the foundation. The analysis results indicate that under long-term wind loads
the interface between the foundation ring and the concrete foundation experiences fatigue shear damage
leading to interface disengagement and stress concentration in the radial reinforcement. The swing of wind turbines causes the lower flange to continuously grind the concrete to form a cavity
and the concrete around the foundation ring is repeatedly stamped and broken. To solve the above problems
based on the on-site investigation and video detection of the flange located beneath the foundation ring
it is recommended to utilize structural epoxy adhesive to fill and reinforce the cavities and cracks surrounding the flange
thereby enhancing its structural integrity. The relevant data of the reinforced wind turbine foundation show that the integrity and crack resistance of the reinforced concrete foundation have been effectively enhanced under the same measured wind load
and the reinforced wind turbine is in good operating condition.
AMPONSAH E, WANG Z Y, KWAME MANTEY S.Bending-bearing behaviour of embedded steel ring-foundation connection of onshore wind turbines[J]. Structures, 2021, 34: 180-197.
WANG W M, GAO Y H, QIU D P, et al.Research on the strengthening and retrofitting methods of existing wind turbine foundations with embedded-ring[J]. IET renewable power generation, 2023, 17(16): 3793-3803.
NEWLANDS M, KHOSRAVI N, JONES R, et al.Mechanical performance of statically loaded flat face epoxy bonded concrete joints[J]. Materials and structures, 2018, 51(2): 49.