Article,

Fatigue performance of socketed terminations to structural strands

, and .
(1983)

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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