Experimental study on the bearing capacity of PZ shape composite dowel shear connectors with elliptical holes

Abstract

The push-out test was carried out in order to study the shear performance of perfobond ribs (PBL) and puzzle (PZ) shape composite dowel shear connectors which are used in corrugated steel–concrete composite bridge decks. By considering the influencing factors of transversal reinforcement, elliptical holes and bonding friction forces, eight specimens were designed and prepared. The load–slip curves were obtained, and the static mechanical properties, including bearing capacity, slip, shear stiffness, and ductility factor, were analyzed. The formula of bearing capacity and load–slip curve were proposed. The results showed a clear deformation of the transversal reinforcement of both the two types of shear connectors. The dominating failure mode of both the shear connectors was the double plane shearing of the concrete dowel. The load–slip curves of the two types of shear connectors followed the same trend. The PZ shape composite dowel performed better in ultimate bearing capacity, ductility, and shear stiffness than the PBL shear connector. Elliptical holes in a PZ shape composite dowel significantly increased the ultimate bearing capacity. The shear stiffness increased with transversal reinforcement and reduced with elliptical holes. For PBL shear connectors, the strain change in the C1 area near the loading point was most apparent. While, the A1 and B1 areas were stress concentration locations for PZ shape composite dowel shear connectors. The two formulas were in good agreement with the test results.

Experimental and numerical study on the shear performance of stainless steel-GFRP connectors for use in precast concrete sandwich panels

“…Commonly utilized connector materials include metals (e.g., stainless steel) and non-metallic materials (e.g., fiber-reinforced materials) 7 , 8 . Metal connectors offer excellent shear resistance, fire resistance, ductility, and affordability 9 . Metal connectors are a viable option when corrosion resistance and wall insulation performance are not primary concerns 10 , 11 .…”

An experimental and numerical study of twin dowel type shear connector

“…The holes increased the shear resistance of the proposed connector significantly. The failure mode was caused by concrete shear failure and no failure of steel dowels occurred 10 .…”

Push-Out experiments on bearing capacity of perfobond leiste shear connectors after hydrochloric acid corrosion

“…Nowadays, the shear performance formula of PBL shear connectors, considering different parameters, was summarized in myriad literature (Zhang et al, 2013). As an illustration, based on the theory of elastic foundation beam, the formulas for calculating the shear stiffness and bearing capacity of the PBL connector were proposed by fully taking into account the number and diameter of holes, penetration plate thickness, concrete strength, the end bearing mode, the friction between the holes and the bond, the penetration bar diameter, and the transverse reinforcement, (Yang and Chen, 2018; Huang et al, 2022). Furthermore, the shear capacity formulas of PBL connectors were evaluated by comparing the slip behavior, shear capacity, and failure modes of PBL connectors with long and round holes (Zheng et al, 2016).…”