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Wind and Structures Volume 33, Number 2, August 2021 , pages 141-154 DOI: https://doi.org/10.12989/was.2021.33.2.141 |
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Aerodynamic and hydrodynamic force simulation for the dynamics of double-hinged articulated offshore tower |
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Mohd Moonis Zaheer and Nazrul Islam
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| Abstract | ||
| Articulated towers are one of the class of compliant offshore structures that freely oscillates with wind and waves, as they are designed to have low natural frequency than ocean waves. The present study deals with the dynamic response of a double-hinged articulated tower under hydrodynamic and aerodynamic loads. The wind field is simulated by two approaches, namely, single-point and multiple-point. Nonlinearities such as instantaneous tower orientation, variable added mass, fluctuating buoyancy, and geometrical nonlinearities are duly considered in the analysis. Hamilton's principle is used to derive the nonlinear equations of motion (EOM). The EOM is solved in the time domain by using the Wilson-θ method. The maximum, minimum, mean, and standard deviation and salient power spectral density functions (PSDF) of deck displacement, bending moment, and central hinge shear are drawn for high and moderate sea states. The analyses' outcome shows that tower response under multiple-point wind-field simulation results in lower responses compared to that of single-point simulation. | ||
| Key Words | ||
| double-hinged articulated tower; dynamic analysis; multi-point wind field; offshore; wind-induced response | ||
| Address | ||
| Mohd Moonis Zaheer: Department of Civil Engineering, Zakir Hussain College of Engineering and Technology, AMU Aligarh-202002, India Nazrul Islam: Department of Civil Engineering, Jamia Millia Islamia, New Delhi, India | ||