Abstract
The Paper examines the response of a preloaded spiral strand --with Its ends fixed against
rotation-to variations in the axi.11 load. The various layers of wires forming the strand have
been modelled as a series of cylindrical orthotropic sheets whose (non-linear) elastic properties
are determined using results from conta<.:t st_ress theory. The strand axial stiffness and !ls
variation with size of axial load perlurbatillll · 1.e. degree of development of mterw1re shpfoilow.
The axial hysteresis values appropriate to fully bedded-in strands can then be
obtained. The predictions of full-slip axial stiffness for a number of practical spiral strands
are supported by experimental results, while a comparison between the theory and some
earlier carefully conducted damping measurements on a long and fully bedded-m 39 mm
OD strand is very encouraging. Theoretical hysteresis predictions are made for a number of
·practical strand constructions. The variation in fully bedded-in axial dampin_g between
strand constructions is shown to be considerable, while long-term cable damping 1s very
unlikely to be as large as has been assumed on the basis of low-cycle tests on newly
rnanufactured spiral strand.
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