Abstract
In the course of a programme of structural appraisals of Independent Broadcasting
Authority guyed masts, it was found for some structures that the calculated maximum guy
forces caused by the currently specified wind loading were greater than the normally
accepted allowable value of one-third of their ultimate strength. Since the loads in the stays
fluctuate owing to changes in wind speed and mast movements, fatigue damage must occur.
A programme of investigation into the fatigue resistance of the socketed cables usually used
for mast stays was thus instigated. Fluctuations of in-line load and r~peated transverse
movements in the presence of a mean axial load were both studied. This Paper summarizes
the results of the experimental study, and discusses some of the implications of the results for
mast stay and suspension bridge hanger design. It is tentatively concluded that a reduction
in the load factor for the stays of guyed masts below three would be inconsistent with the
normal steelwork safety factor of l ·7. For suspension bridge hangers some reduction from
normally accepted values may be appropriate if regular inspections can be ensured.
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