Modified Push-out Tests for Determining Shear Strength and Stiffness of HSS Stud Connector-Experimental Study

Abstract

This paper presents, modified push-out tests conducted for the determination of shear strength and stiffness of high strength steel (HSS) studs. The HSS studs having ultimate strength of 900 MPa and yield strength of 680 MPa are used in the modified push-out specimens. The reinforced concrete slabs of push-out specimens which have provided dimensions as recommended by BS5440 part-v, but with enhanced transverse reinforcement for higher splitting strength. Enhancement of splitting strength is considered due to confinement of the concrete with hoop type transverse reinforcement at smaller spacing. Mander's model is considered to estimate the enhancement in the splitting strength due to increase in the confined compressive strength of concrete. Novelty of this study may be considered in highlighting the importance of confined concrete strength while designing pushout specimens. Experimental value of shear strength of HSS studs is found to fall in between the extreme bounds specified by the Eurocode 4 formulae. Further improvements are possible by the addition of steel fibres concrete in the vicinity of HSS studs embedded in RC slab of push-out specimens.

Push-out experimental evaluation of pultruded FRP-concrete compsites

“…The stiffness of the shear connection was estimated up to 110 kN/mm for specimen 6 with the 16 mm stud size (PO-16B-S6). The shear stiffness is approximately 50% comparable to steel-concrete shear stiffness of 223.81 kN/mm reported by Prakash et al (2012) for 20 mm stud diameter. However, shear stiffness of connection for steelconcrete varies due to factors such as clearance holes, stud strength and concrete strength respectively.…”

“…Fifth International Conference on Sustainable Construction Materials and Technologies. http://www.claisse.info/Proceedings.htm For a long time, steel-concrete composite (SCC) construction has been one of the fastest moving, economical and eco-friendly methods of construction and has been extensively used in high rise buildings as well as in medium span bridge decks (Prakash A, 2012). Nonetheless, steel has its disadvantages, which include its heavy weight and highly corrosive nature demanding frequent maintenance during its use in the long term.…”

Experimental Study and Finite Element Modelling of Push-Out Tests on a New Shear Connector of I-Shape

“…The distance between the web of I-shape connector and the bottom end of the concrete slab was kept constant at 210 mm for all specimens. These dimensions are similar to those used in other push-out tests with other types of shear connectors [11][12][13][14][15]. Most specimens were reinforced longitudinally and transversely with four 8 mm diameter bars positioned in two layers for each concrete slab, for some specimens in Series D, the number of longitudinal bars kept constant while the transverse bars were varied to six and eight bars for each concrete slab.…”

“…Each lift was thoroughly vibrated to eliminate air voids adjacent to the I-shape connectors. This form of casting has been successfully used by Veldanda & Hosain [16], Studnicka et al [17], Medberry & Shahrooz [18], Veríssimo [19], Vianna et al [20] and by Prakash et al [14]. Adoption of this procedure leads to a significant reduction of the time for execution of the test program, as well as of costs associates to the cut and the welding of the steel beams that would be necessary to execute the casting in horizontal position [21].…”

Influence of Shear Connector Size on Ultimate Strength in Composite Construction with Cold-Formed Steel Channel Lipped Section

“…The composite action is categorized by an interactive behaviour between structural steel and the concrete designed to utilize the best load resistance capability. For the concrete and steel to act compositely, a mechanical means of shear connection must be provided [6] and the most widely used shear connection system is welding of conventional headed studs on the flanges of the steel section to resist the longitudinal shear that will be transferred between concrete slab and the steel section [7].…”