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Keywords: advanced composite materials, fibre-reinforced polymers, latticed towers, filament winding.

Summary

This paper presents results from a research project carried out at the University of Manitoba, Winnipeg, Canada, which examines the potential of manufacturing fibre-reinforced polymer (FRP) lattice tower segments using the filament winding process. The main advantage of this process, for the specific application, is that it can generate a monolithic and continuous lattice structure with no joints between individual members, a method which eliminates the use of labour-intensive but also fatigue-prone, bolted connections. Both theoretical and experimental work has been carried on a tower segment, 8534 mm (28 ft) in length and consisting of four equal sections 2134 mm (7 ft) in length each, fabricated and tested under static and dynamic loading. This segment was chosen to represent the bottom portion of a 44804 mm (147 ft) full scale FRP tower spanning between the base and the first set of guys. The purpose of the testing was to verify a theoretical model obtained from the finite element (FE) program ANSYS Ver. 8.1 [1]. The tower was designed according the current CSA-S37 Standard [2] and the EIA-222F Specification [3]. The test conditions were created to resemble actual restraints and loading conditions acting on the most stressed tower sections. Laboratory testing of standard coupons was also conducted according to ASTM standards to determine all necessary material properties used in the FE analysis. The experimental results correlate well with theoretical findings from FE analysis. The dynamic properties of the tower segment were also verified by a single degree of freedom mathematical model.

The results from this study are currently being used for the design and fabrication of an 82-m tower. This tower will consist of fourteen segments, 5.867-m each. This novel technique of filament winding allows the design of a tower that can handle more severe loading conditions, especially icing, that have been the cause of several tower failures across Canada. As meteorological wind towers do not presently measure icing conditions, the proposed facility will be unique as capacity-based icing sensors will be installed to quantity the severity of icing and to evaluate the performance of both meteorological instruments and the tower structure under severe conditions.

References

1: ANSYS, Version. 8.1, Reference Manual, ANSYS Inc., 2004.
2: Canadian Standards Association CSA, "Antennas, Towers and Antenna-Supporting Structures", Standard S37-94, Rexdale, Ontario, 1994.
3: Electric Industries Association (EIA), "Structural Standards for Steel Antenna Towers and Antenna Supporting Structures", Standard EIA-222-F, 1996.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 88 PROCEEDINGS OF THE NINTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: B.H.V. Topping and M. Papadrakakis Paper 2 Development of Latticed Towers Using Advanced Composite Materials A. Ochonski¹, D.J. Polyzois¹ and I.G. Raftoyiannis² ¹Department of Civil Engineering, University of Manitoba, Winnipeg, Canada ²Department of Civil Engineering, National Technical University of Athens, Greece doi:10.4203/ccp.88.2 purchase the full-text of this paper Full Bibliographic Reference for this paper A. Ochonski, D.J. Polyzois, I.G. Raftoyiannis, "Development of Latticed Towers Using Advanced Composite Materials", in B.H.V. Topping, M. Papadrakakis, (Editors), "Proceedings of the Ninth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 2, 2008. doi:10.4203/ccp.88.2 Keywords: advanced composite materials, fibre-reinforced polymers, latticed towers, filament winding. Summary This paper presents results from a research project carried out at the University of Manitoba, Winnipeg, Canada, which examines the potential of manufacturing fibre-reinforced polymer (FRP) lattice tower segments using the filament winding process. The main advantage of this process, for the specific application, is that it can generate a monolithic and continuous lattice structure with no joints between individual members, a method which eliminates the use of labour-intensive but also fatigue-prone, bolted connections. Both theoretical and experimental work has been carried on a tower segment, 8534 mm (28 ft) in length and consisting of four equal sections 2134 mm (7 ft) in length each, fabricated and tested under static and dynamic loading. This segment was chosen to represent the bottom portion of a 44804 mm (147 ft) full scale FRP tower spanning between the base and the first set of guys. The purpose of the testing was to verify a theoretical model obtained from the finite element (FE) program ANSYS Ver. 8.1 [1]. The tower was designed according the current CSA-S37 Standard [2] and the EIA-222F Specification [3]. The test conditions were created to resemble actual restraints and loading conditions acting on the most stressed tower sections. Laboratory testing of standard coupons was also conducted according to ASTM standards to determine all necessary material properties used in the FE analysis. The experimental results correlate well with theoretical findings from FE analysis. The dynamic properties of the tower segment were also verified by a single degree of freedom mathematical model. The results from this study are currently being used for the design and fabrication of an 82-m tower. This tower will consist of fourteen segments, 5.867-m each. This novel technique of filament winding allows the design of a tower that can handle more severe loading conditions, especially icing, that have been the cause of several tower failures across Canada. As meteorological wind towers do not presently measure icing conditions, the proposed facility will be unique as capacity-based icing sensors will be installed to quantity the severity of icing and to evaluate the performance of both meteorological instruments and the tower structure under severe conditions. References 1 ANSYS, Version. 8.1, Reference Manual, ANSYS Inc., 2004. 2 Canadian Standards Association CSA, "Antennas, Towers and Antenna-Supporting Structures", Standard S37-94, Rexdale, Ontario, 1994. 3 Electric Industries Association (EIA), "Structural Standards for Steel Antenna Towers and Antenna Supporting Structures", Standard EIA-222-F, 1996. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £145 +P&P)
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