Hybrid lattice-tubular towers requires a transition piece which serves as a connection between lattice and tubular parts. As the transition piece is supposed to transfer all the dynamic and self-weight loads to the lattice and foundation, these structural elements present unique features and are critical components to design and ought to resist strong cyclic bending moments, shear forces and axial loads. Well-designed transition pieces with optimized ultimate state and fatigue capacities for manufacturing, contribute to the structural soundness, reliability and practicability of new onshore wind turbines hybrid towers.
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