A Comparative Study on Lattice Tower Angle Member Capacities as Per Indian, American, and BSEN Standards
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Abstract
The transmission lines and Telecommunication networks are normally supported by lattice towers. Therefore, the reliability of these essentials depends much on the reliability of the towers and their foundations. In Both telecom and power transmission line sectors, the towers are mass-produced and generally based on optimized tower weight and foundation volumes. The weight of a tower is influenced to a great extent by the selection of tower configuration, choice of bracing patterns, choice of steel grade, and profile type. The towers in general are lattice types consisting of main legs, diagonals, horizontals, cross-arm members, and peak members. The telecommunication and power transmission line tower members are generally made of steel equal-angle sections. These tower members are modeled and analyzed as pin-jointed 3-dimensional space truss models and the members are subjected to axial forces, either axial compression or axial tension in nature. Estimation of member compression capacity is the most vital parameter in design as per respective local standards and proving those estimations during full-scale model tower testing if carried out. This paper presents the differences in axial compression capacity of angle members as per Indian, American, and European standards viz., IS: 802 (Part 1/Sec 2)-2016, IS 800-2007, ASCE 10-15 and BS EN 1993-3-1:2006.
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References
- IS 875:2015: Design loads (other than earthquake) for buildings and structures Part1-Dead loads, Part 2- Imposed loads, Part 3- Wind loads, Part 4- Snow loads, Part 5- Special loads and load combinations.
- IS17740:2022: Isolated towers, masts, and poles using structural steel-code of practice
- IS 800:2007: General construction in steel-code of practice.
- ASCE10-15: Design of lattice steel transmission structures.
- IS 802 (Part-1/Sec-2)-2016: Use of structural steel in overhead transmission line Ttowers. Sec- 2: design strength.
- BSEN 1993-3-1:2006: Design of steel structures-Part 3-1: Towers, masts and chimneys- Towers and masts.
- Adluri SMR, Madugula MKS. Torsional- Flexural buckling strength of steel angles. Can J Civ Eng. 1996; 23:260-71. https://doi.org/10.1139/l96-027
- Shi G, Zhou W-J, Bai Y, Liu Z. Local buckling of steel equal angle members with normal and high strengths. International Journal of Steel Structures. 2014; 14(3):447- 55. https://doi.org/10.1007/s13296-014-3002-0
- Filipović A, Dobrić J, Marković Z, Baddoo N, Flajs Z. Journal of the Croatian Association of Civil Engineers. 2563-2014.
- Kang W, Albermani F, Kitipornchai S, Lam H-F. Modeling and analysis of lattice towers with more accurate models. Advanced Steel Construction. 2007; 3(2):565-82. https:// doi.org/10.18057/IJASC.2007.3.2.3
- ANSI/TIA-222-H- Structural Standard for Antenna Supporting Structures, Antennas, and small wind turbine support structures. (Revision of ANSI/TIA-222-G)
- AS 3995- Design of steel lattice towers and masts- Australian standard; 1994.