Experimental study on shear strength of headed stud shear connectors at high temperature

Abstract

The paper is intended to summarize findings from high-temperature tests on headed stud shear connectors conducted as part of a study on the fire resistance of composite beams. Two headed stud shear connectors on a H-shaped steel beam are embedded in two types of slab models, representing a reinforced concrete slab and a composite slab with profiled steel decks, respectively. The test parameters other than model configurations include strength of concrete, level of shear loading, and heating conditions. A total of sixteen models were tested. It is found that the most crucial design parameter is the temperature at the bottom of a headed stud shear connector. Based on the test results, a new formulation is proposed to calculate with a good accuracy the shear capacity per stud only taking account of the heat-induced degradation of steel concrete materials.