To illustrate the potential mass reduction of the anisogrid lattice design in common wind energy towers, the optimized masses required to withstand the limiting load case G+1.5W including tower self-weight (Eurocode 1-1-4) were calculated and compared using a simplified structural model* for three steel tower concepts.
Mass savings for wind power towers. The optimal mass to withstand load case G+1.5·W (EC1-1-4) were calculated for a simplified structural model of a 76m height tower. The anisogrid design with tubular ribs halves material costs. Such lattice structures with hollow structural members are cost-effectively manufactured with the offered nodal system.
For diameters greater than 4.5 m, the anisogrid lattice design with hollow circular ribs outperforms all others. It is 2 times lighter than the reference tubular design and a 30% lighter than anisogrids with solid rectangular ribs.
* Material properties, dimensions, and design loads for this example of wind energy tower were: L= 76 m, E= 200 GPa, F= 2489 kN and M= 88606 kNm. The material was structural steel of σ= 355 MPa, v=0.3, and ρ=7850 Kg/m3. [HISTWIN RFS-CT-2006-00031, page 9]