Structural Response of Steel Towers to Wind Loading
- Author M. Yanda
- Co-Author M. A. Matazu, and O. S. Abejide
- DOI 10.17605/O
- Country : Nigeria
- Subject : Civil Engineering
Keywords : Steel Structure, Wind loads, Mast, Tower, Telecommunication
Abstract
In this work, effort is made to analyse how steel structures such as steel towers used in telecommunication industries behaves under wind load which is the most predominant and dynamic load. A telecommunication steel tower of 67.12m high is chosen for this work, and the geometry of the tower, as modelled, is 7.6m at the base and 2.0m at the top. It has sloping legs to about 42.72m in height and remain straight up to the top. The structure is divided into four sections in order to allow the wind load to be modelled adequately on the structure for the global analysis. The determination of wind loads was carried out on the basis of BS EN 1993-3-1 (2006), using the Nigerian basic wind speeds from five different zones 1, 2, 3, 4 and 5 with the values 42m/s, 45.8m/s, 50m/s, 55m/s and 56m/s respectively. Bracing members’ projections in faces parallel to the direction of wind, and in plan and hip bracing were not considered in the determination of the projected area of the structure. It was seen from the analysis that the background wind loading of 3360.88 N/m2 from zone 5 is the quasi-static loading produced by fluctuations due to turbulence. The wind load in that zone produced the highest displacement of joints, which can provide enough frequency that is capable of triggering collapse on the tower.
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