Residual Static Strength of Concrete Cylinder Specimen and Stud Anchor Specimen after Cyclic Loadings

The residual strength tests after cyclic loadings on concrete cylinder specimens and stud anchor specimens were performed to obtain data regarding effects of cyclic loadings on concrete and stud anchor specimens for proposing a new method capable of evaluating the soundness of equipment support using the S-N curves. More specifically, cyclic loadings may lead to a reduction in the strength and stiffness of concrete and also lead to the pullout and a reduction of the strength of stud anchor sections, which may reduce the rigidity of the equipment support, and this situation is not preferable from the viewpoint of long-term soundness evaluation. Then, in order to investigate whether or not cyclic loadings reduce the strength and the rigidity of the equipment support, cyclic compressive loadings with constant amplitude were applied to cylinder specimens, then static compression tests were performed. Also, cyclic tensile loadings with constant amplitude were applied to stud anchor specimens, then static pullout tests were performed. As a result, it was found that the cyclic loading would not lead to the pullout of stud anchor and a reduction of the strength of stud anchor if the maximum stress ratio is less than the long-term allowable stress.