Experimental studies on shear connection between steel and lightweight concrete using studs: Fid-Bau Portal

Experimental studies on shear connection between steel and lightweight concrete using studs

Cruz, Paulo J.S. / Valente, Isabel / Hegger, Josef / Rauscher, Sabine / Goralski, Claus

This contribution describes Standard Push-Out Tests (POST) carried out at University of Minho (UM) as well as Single Push-Out Tests (SPOT) performed at the Institute of Structural Concrete at RWTH Aachen University using high strength lightweight concrete (HSLWC). The test configuration follows the EC4 recommendations and repeats some dispositions referred by other authors. The experimental studies carried out at UM and RWTH include tests on studs with diameters of 19, 22 and 25 mm and also tests on studs of 19 mm diameter, which are grouped in pairs. The purpose of the experiments conducted is to determine the load-bearing capacity as well as the deformation capacity of the commonly used headed shear stud when using high strength lightweight concrete. The results from these tests are compared to those from the tests performed with high strength normal weight concrete (HSNWC). As observed and measured during the series of Push-Out tests performed, HSLWC is adequate to be used in composite structures. The results show some loss of load capacity. compared to NWC specimens, but a good general behaviour is noticeable, with a tendency of an increase in deformation capacity. The Single Push-Out test proved to be a good alternative to the Push-Out Standard Test, when LWC is used and the resulting differences match the ones already observed for NWC. The type of failure observed in the POST for 25 mm headed studs shows that a HSLWC with compressive strength at least higher than 55 MPa should be used in order to generate steel failure. In general, the connectors showed a ductile behaviour. as the plastic slip exceeds the value of 6 mm, which is demanded in EC4.