This part of BS 8100 gives recommendations for procedures to be used to determine the loading for the design or appraisal of free-standing tower structures of lattice construction.
Whilst Section 3 and Section 4 are applicable to the loading of guyed masts, the gust response factors contained in Section 5 should not be used for the design of such structures. Until such time that this part of BS 8100 is extended to cover guyed masts, recourse should be made to published sources to determine their response to gust loading. In addition, the safety factors set out in Section 2 may be inappropriate to guyed masts and should only be used for general guidance purposes.
The procedures given primarily apply to bolted, riveted, or welded metallic structures of up to 300 m height and composed of leg members and triangulated bracings, but they also encompass towers of geodetic form. Section 5 may be inappropriate for towers of Vierendeel form, due to their stiffness characteristics. The response of such towers should be determined using published sources.
This part of BS 8100 covers dead loads and wind and ice loading. Other superimposed loads are not covered and, where appropriate, should be considered.
This part of BS 8100 is applicable to structures in the UK for which specific meteorological data are given. Guidance is also provided on the use of this part of BS 8100 for structures in other countries.
This part of BS 8100 is based on the principles of limit state design and the partial safety factors given are appropriate only for towers designed in accordance with this standard.
A flow chart indicating the design procedure using this part of BS 8100 is given on a separate sheet provided with this standard.
NOTE The titles of the publications referred to in this standard are listed on the inside back cover.