Abstract
To reduce the depth of floor-beam structures and to save the cost of headed-shear studs, many types of shallow composite beam have been developed during the last few years. Among them, the shallow-hollow steel beam consists of web openings, infilled with in-situ concrete (named concrete dowel) has been increasingly focused recently. In this new kind of structure, this concrete dowel plays an important role as the principal shear connector. This article presents an investigation on the shear transferring mechanism and failure behavior of the trapezoid shape concrete dowel. An experimental campaign of static push-out tests has been conducted with variability in the number of web openings (WOs). The results indicate that the mechanical behavior of concrete dowel could be divided into crushing, compression, and tension zones and exhibits brittle behavior. The longitudinal shear resistance and specimen's stiffness are strongly affected by the number of considered WOs
Highlights
D ue to the growing demand for shallow floor beam structures, numerous slim floor system has been developed [1], including Slimfoor [2], Asymmetric Slimflor Beam [3], Ultra Shallow Floor Beam [4,5,6] and DELTABEAM [7], which are used in commercial and residential buildings, hospitals, schools, etc
Unlike a conventional composite beam system, where the composite action is provided by shear connectors welded to the top flange of the steel beam and embedded in the concrete slab, the composite action of the new type shallow floor is primarily provided by the concrete dowel shear connectors between the hollow steel beam and concrete
The load-slip behavior clearly showed that the shear resistance is affected the number of web openings (WOs) considered, i.e., concrete dowels in pushout tests
Summary
D ue to the growing demand for shallow floor beam structures, numerous slim floor system has been developed [1], including Slimfoor [2], Asymmetric Slimflor Beam [3], Ultra Shallow Floor Beam [4,5,6] and DELTABEAM [7], which are used in commercial and residential buildings, hospitals, schools, etc. This article presents an investigation on the shear transferring mechanism and failure behavior of the trapezoid shape concrete dowel. The behavior of concrete dowel could be estimated based on theoretical calculation method for the shear resistance or experimental investigation method with push-out tests on [14].
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