A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Design Procedure for Tubular Lattice Towers for Small Wind Turbines
This paper describes a design procedure for self-supporting lattice towers for small wind turbines, particularly suitable for remote areas where monopole towers cannot be transported easily. In addition, lattice towers are inherently cheaper. The IEC small wind turbine safety requirements were combined with the major design standards and codes for steel structures: ASCE, Eurocode 3, and AISC. These three codes gave very similar values for the minimum leg dimensions to prevent buckling. Triangular and rectangular lattice towers were modeled as tripod and quadrapod towers respectively by ignoring the bracing. Analytical equations were derived for the maximum compressive stress in the tower legs in order to predict the buckling strength of tower legs and for the tower-top deflection to ensure linear-static behaviour of the structures. Using the analytical equations, a designer can quickly get approximate values for the optimum leg diameters and base distance, defined as those that just avoid buckling or can easily determine the required base distance for a given size of steel sections. After this preliminary design, a more accurate analysis such as finite element analysis can be performed to finalize the design primarily in terms of the bracing. Specific design examples were presented to illustrate the design procedure. Two 12 m high rectangular and triangular lattice towers were designed for a 500 W wind turbine. Similarly, two 18 m high rectangular and triangular lattice towers were designed for a 5 kW turbine. From the results of the design examples, it is concluded that the rectangular lattice towers are suffer but slightly heavier than the equivalent triangular lattice towers.
Design Procedure for Tubular Lattice Towers for Small Wind Turbines
This paper describes a design procedure for self-supporting lattice towers for small wind turbines, particularly suitable for remote areas where monopole towers cannot be transported easily. In addition, lattice towers are inherently cheaper. The IEC small wind turbine safety requirements were combined with the major design standards and codes for steel structures: ASCE, Eurocode 3, and AISC. These three codes gave very similar values for the minimum leg dimensions to prevent buckling. Triangular and rectangular lattice towers were modeled as tripod and quadrapod towers respectively by ignoring the bracing. Analytical equations were derived for the maximum compressive stress in the tower legs in order to predict the buckling strength of tower legs and for the tower-top deflection to ensure linear-static behaviour of the structures. Using the analytical equations, a designer can quickly get approximate values for the optimum leg diameters and base distance, defined as those that just avoid buckling or can easily determine the required base distance for a given size of steel sections. After this preliminary design, a more accurate analysis such as finite element analysis can be performed to finalize the design primarily in terms of the bracing. Specific design examples were presented to illustrate the design procedure. Two 12 m high rectangular and triangular lattice towers were designed for a 500 W wind turbine. Similarly, two 18 m high rectangular and triangular lattice towers were designed for a 5 kW turbine. From the results of the design examples, it is concluded that the rectangular lattice towers are suffer but slightly heavier than the equivalent triangular lattice towers.
Design Procedure for Tubular Lattice Towers for Small Wind Turbines
Adhikari, Ram C. (author) / Wood, David H. (author) / Sudak, Les (author)
Wind Engineering ; 38 ; 359-376
2014
18 Seiten, Bilder, Tabellen, 20 Quellen
Article (Journal)
English
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