Abstract
In steel and concrete composite structures, it is unfavourable to install many headed studs or perfobond ribs with narrow spacings at the joints. To solve this problem, a new type of a mixed shear connector was developed by combining a headed stud and perfobond rib at the same steel beam flange. In this paper, totally nine push‐out tests were conducted. The main purpose was to compare the failure mode and the load‐slip behavior of the headed stud, perfobond rib, and mixed shear connector. Furthermore, 19 nonlinear finite element simulations were performed. The effects of connector dimension and material properties on the structural behaviors of mixed shear connectors were studied. Based on the experimental and parametric study, an analytical equation was finally proposed to evaluate the shear capacity of perfobond rib with a headed stud mixed shear connector.
Highlights
In the past few decades, composite structures made of steel and concrete have been increasingly used in construction and bridge engineering. e main reason is their optimum structural performance and favourable cost
Concrete dowels will form in these holes after casting to resist both shear and uplift forces. e perfobond rib connector has some advantages over the headed stud, such as easier installation by using continuous fillet welds, higher shear stiffness, and favourable fatigue performance. us, the perfobond connectors are increasingly designed and used in composite structures [10, 11]
E push-out failure of the mixed shear connector was caused by the stud shank fracture, concrete crushing below the stud root, yield of the perforating rebar, and concrete dowel shear at the same time
Summary
In the past few decades, composite structures made of steel and concrete have been increasingly used in construction and bridge engineering. e main reason is their optimum structural performance and favourable cost. E effects of the shank diameter, stud length, material properties, and loading directions on the shear behavior of the headed stud have been studied [12, 13]. Installing many headed studs or perfobond ribs at one steel beam flange would narrow the spacings, which is unfavourable for the bearing performance of shear connectors. It would increase the difficulty in placing the reinforcing bars between headed studs and perfobond ribs. Based on the experimental and numerical results, an analytical equation was derived to predict the shear capacity of perfobond rib with headed stud mixed shear connector
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