filament winding 54 jec composites magazine / No65 May –June 2011 Fig. 8A & B: Anchoring system: forks, screw bolts and monopost Fig. 7: Layout of the forskin in the footing Fig. 6: External and internal reinforcement of the joint lines Material and manufacturing technique The monopost was made of a composite material consisting of 65% glass fibre and 35% thermosetting resin. A transparent vinylester matrix resin was used to obtain translucent parts. A red pigment was added in the finished surface. Filament winding technology was used for this project. The joining parts were made by hand lay-up. an established calculation [2-3], sixteen corrugated steel forks (Ø20) were radially distributed at the bottom of the footing. After the first concrete pouring, they were assembled using Jshaped steel screw bolts. The figures also show the buried part of the monopost and the layer of granulated marble dust that was spread on each side of the monopost to improve friction between the two materials. Although the automatic process produces hollow, cylindrical shapes with very accurate fibre placement, it is recommended to carry out tests in compliance with the standards listed in references [5-8]. The tests Tab.2: Mechanical value make it possible to accurately determine the Mechanical Test values mechanical characteristics characteristics of the material. Tensile strength (MPa) 450 250 25 Fig. 9: Filament winding process The mechanical values achieved with the standardized tests are summarized in the table 2. Yield limit (MPa) Elastic modulus, EL (GPa) Loads on the structure The geographical location of the monopost determines the wind load the structure has to withstand. According to the instructions of Eurocode 1 [1], a logarithmic variation of the wind pressure as a function of height was considered and a distribution of eolian external coefficients depending on the covered angle was adopted, see Figure 10. Fig. 10: Diagram of eolian coefficients around the cylinder according to Eurocode 1