Experimental Studies on the Behaviour of Headed Stud Shear Connectors at Elevated Temperatures

Abstract:

In particular, 24 push-out tests were carried out in Tongji University to investigate the performance of the shear stud at elevated temperatures. Three different floor arrangements including solid slabs, composite slabs with trapezoidal steel sheeting parallel to the steel beam and composite slabs with trapezoidal steel sheeting perpendicular to the steel beam, were considered in tests. It was observed in the test that the predominant mode of failure for the solid slabs and profiled slabs with trapezoidal steel sheeting parallel to the steel beam was headed stud shear failure while the predominant mode of failure for the profiled slabs with trapezoidal steel sheeting perpendicular to the steel beam was concrete cracking failure at low temperatures and stud shear failure at high temperatures. Also, the ultimate load in solid slabs was generally higher than that in the profiled slabs. In addition, the ultimate load and stiffness decreased with increasing temperature for all slabs. By analyzing the test results, an empirical equation was proposed to calculate the shear capacity of studs.