Abstract
In this study, in order to identify crack developing states in the perforation and effect of coarse aggregate on the shear resistance mechanism of perfobond rib shear connectors (PBL), experimental verifications through partial loading tests and standard static tests using 3D scanner and X-ray computed tomography (X-ray CT) have been carried out. The partial loading tests clarified that the coarse aggregate across shear fracture surfaces affect the progress of the cracks, and convex portion of rough crack surface is broken when the load reaches the maximum shear force. The image of X-ray CT demonstrated that the maximum shear force of the PBL increases when a excessive large coarse aggregate lays across the both shear fracture surfaces. Furthermore, the roughness of shear fracture surfaces of PBL were measured with the 3D scanner. The results showed that the standard deviation and the height difference of the irregularities affect the maximum shear force. These experimental facts suggested the failure process and the shear resistance mechanism of PBL with restraints.
