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The paper presents a study of the influence of cyclic loading on
the cleavage length at the steel-concrete interface.The
variables were number of repetitions of load,level of repeated
loads,steel stress,concrete strength,concrete cover thickness
and bar diameter.the 240 uniaxial specimems were tested under
both monotonic and cyclic loading to simulate a segment of the
tensile portion of a reinforced concrete beam between two
successive tensile cracks.The results of the study showed that
the maximum cleavage length under cyclic loading tests was found
to be significantly large then the maximum cleavage length
measured under monotonic loading tests.the maximum cleavage
length also increase with increasing cover thickness and
concrete strength respectively.the bar sizes had little effect
on the cleavage length.Both the crack width on the concrete
surface under loading and unloading were not found to be
significantly affected by the magnitude of the cyclic loading.
the crack width in the gergely-lutz expression as adopted by the
aci 813-83 applies reasonably to the reinforced concrete members
subjected to cyclic loading.
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