08.21: Shear strength of headed stud push‐out tests: Comprehensive literature review focusing on slab type, failure mode, and large‐diameter headed stud

Abstract

ABSTRACTIn the revised 2011 Japanese Industrial Standards, headed studs of 10 mm and 25 mm diameters were addressed. However, consideration of their mechanical properties remains insufficient; the shear strength characteristics of headed studs with diameters of more than 25 mm should be considered. To verify the shear strength of headed studs with other diameters, studies have been conducted using various methods. However, few studies have examined their overall shear strength tendencies. In this literature review, therefore, the shear strength tendency is comprehensively evaluated using experimental data from existing push‐out test results.The push‐out test results were obtained from published studies. Of the 1,002 results, the shear strength characteristics of headed studs were analyzed in terms of the headed stud diameter, slab type, and failure mode. The shear strength of the headed studs in solid slabs was approximately equal to the product of the headed stud tensile strength and total cross‐sectional area of the headed stud shaft component. The shear strength value was approximated because the push‐out test results were influenced by both the pure shear strength and concrete strength. This tendency was especially prominent in the case of headed stud failure. A similar tendency, although with variations, was observed in the case of concrete failure.The shear strength of headed studs in slabs with a steel deck cut on the flange also showed a trend similar to that in solid slabs. On the other hand, the shear strength of headed studs in slabs with a steel deck across the flange showed a different tendency and was less than that in solid slabs. The specimens having slabs with steel decks across the flange could be classified as those having headed studs welded through a steel deck and those having headed studs directly welded to the flange. However, their shear strength tendency was almost equal. The shear strength of headed studs with a diameter of more than 25 mm in solid slabs gradually decreased with the increasing diameter in both failure modes. Through comprehensive studies, three kinds of shear strength evaluation formulas were derived. Furthermore, the shear strength of the headed studs with a diameter of more than 25 mm were studied by slab type and failure mode.