Your project Technical datanof the project: Designed in wind class II and EC3 Dimensions of triangle: 0,5m Base section: 1m Tower sections: 6 x 5,5m Anti-twist section: 3m Top section: 3m Total: 1m + 6 x 5,5m + 3m + 3m = 40m Guyed in three (3 x 120°) Distance between base section and anchorage guys: 21m Guys are to be placed under pre-tension, in compliance with calculation Accessories: The tower is designed to be used as a ladder Fall protection system Obstruction light Interface dishes Steel quality tower: AE 235 Steel quality guys: galvanised 1770N/mm² Tower is galvanised in compliance with norm Weight: 2000 kg (accessories included, foundation excluded) Location: Senegal - Gandiaye (180km from Dakar) Mission: Design, calculation, manufacturing and installation of a 40m guyed lattice tower at Gandiaye, to serve as an expansion of the Sentel mobile phone network (Dakar - Kaolack). Rules for the design of the Lattice tower: In compliance with the NBN B03-002-1 & 2 wind norms class II and EC3 for steelworks. Dimensions of the terrain: 40m x 40m Guyed 40m lattice tower in triangle with anti-twist system Antennas on top of tower (2 dishes, 6kN & 7kN wind force) Maximum deflection on top of 0,5° Accessories: Cable ladder Fall protection system Obstruction light All calculations, for what the wind is concerned, are to be made manually in compliance with the NBN norms. Use of ESA-Prima Win Advantages: 3D (easy input of geometries) Physical non-linear conditions (simulation guys and pretension) 2-nd order frame (method Newton raphson) Fast calculation Easy output control Dynamic document Good graphical presentation Easy support access and fast feedback Disadvantages: Manual calculation of the wind for lattice towers Characteristics of guys Pre-tension guys Maximum deflection in distance (no degrees) Experiences with esa-prima win: Started working with ESA-Prima win in April 2000. The complete 3D design software offers easy input of all reality elements. The more specific factors of the design can be discussed in cooperation with the support department of ESA-Prima Win, which results in a perfect simulation of the project. The 3D software makes it easier to simulate the 4 wind directions (N, S, E & W). Specific input of the characteristics of the guys are based on my personal experience. The first simulation of the pretension of the guys is based on my own experience. The final simulation results in a perfect pre-tension in the guys, which then again results in a perfect dimension of the guys. The guyed lattice tower is calculated with the Newton Raphson method. Easy output of the results of the calculation. Easy control of the pre-tension of the guys. Good graphical output of the results: The guyed lattice tower is actually shown on the screen in the way it will look in reality. A major advantage of the program is the dynamic document: when changing an input, one click shows the difference in the document. However, working with ESA-Prima Win made me discover some bugs in the program. These bugs have been corrected in the new releases. Modules: 2D-frame 2D-grid 3D-frame Dynamic document 2-nd order frame Physical non-linear conditions 27 SCIA User Contest Catalog
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