Many headed studs are embedded in RC shear walls in nuclear-related facilities in order to fast some equipments and pipings. The purpose of this paper is to present basic experiment data and to decide the criteria for designing a headed stud embedded in a shear wall under earthquake. Pull out strength of a headed stud due to cone failure of concrete with and without cracks was examined. Tests results show that the pull-out strength decrease due to cracks running through the stud, but it almost recovers when the cracks are closed again by a external compressive load. Relation between recovery rate and magnitude of compressive stress is empirically formulated.
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