Design and Parametric Sensitivity Analysis of a Steel-Concrete Hybrid Semi-Submersible Foundation Supporting a 15 MW Wind Turbine

作者：Wenwen Hu, Ling Wan, Shuai Li, Shaorun Zhang, Yang Yang, Jungang Hao, Yajun Ren · 发表于：Journal of Marine Science and Engineering · 年份：2026 · DOI：10.3390/jmse14070669 · 研究领域：Wave and Wind Energy Systems、Fluid Dynamics and Vibration Analysis、Vibration Control and Rheological Fluids

With the rapidly growing global demand for clean energy, offshore wind power has become an important renewable energy source. To clarify how the principal dimensions affect the performance of a 15 MW-class floating wind turbine platform in 100 m water depth, this paper proposes a steel-concrete hybrid semi-submersible platform and systematically performs a parametric sensitivity analysis. The platform adopts a three-column configuration with heave tanks. The upper columns and cross braces are made of steel, while the lower hexagonal columns, pontoons, and heave tanks are constructed from concrete, significantly reducing steel consumption while satisfying structural and stability requirements. Focusing on three key design variables—draft, column spacing, and column diameter—this study establishes a unified normalized sensitivity analysis framework. It quantitatively evaluates their influence on platform mass, intact stability, natural periods, and fully coupled dynamic responses (including surge, heave, pitch motions, and mooring line tensions) under both operational and extreme conditions. The results reveal distinct roles of the principal dimensions in governing the platform dynamics: column spacing is the most sensitive parameter for tuning pitch response, restoring stiffness, and stability; increasing draft effectively suppresses heave and pitch responses but has only a limited effect on low-frequency surge motions; and column diameter strongly affects the natural periods ...