Abstract
Shear connectors are used in steel beam–concrete slabs of composite frame and bridge structures to transfer shear force according to design loads. The existing Y-type perfobond rib shear connectors are designed for girder slabs of composite bridges. Therefore, the rib and transverse rebars of the conventional Y-type perfobond rib shear connectors are extremely large for the composite frames of building structures. Thus, this paper proposes stubby Y-type perfobond rib shear connectors, redefining the existing connectors, for composite frames of building structures; these were used to perform push-out tests. These shear connectors have relatively small ribs compared to the conventional Y-type perfobond rib shear connectors. To confirm the shear resistance of these stubby shear connectors, we performed an experiment by using transverse rebars D13 and D16. The results indicate that these shear connectors have suitable shear strength and ductility for application in composite frame structures. The shear strengths obtained using D13 and D16 were not significantly different. However, the ductility of the shear connectors with D16 was 45.1% higher than that of the shear connectors with D13.
Highlights
Steel–concrete composite structural systems with shear connectors have excellent structural performance and economic feasibility, and have been employed in various fields for decades.In particular, beam–slab composite systems have been widely used in building and bridge structures, and are beneficial for withstanding extreme conditions such as fire and earthquake
Stubby Y-type perfobond rib shear connectors were proposed for composite frames of building structures by modifying the conventional Y-type perfobond rib shear connectors [32,33,34,35,36]
The concrete blocks of the push-out test specimens were destroyed to identify the deformation of the ribs and transverse rebars in each loading stage
Summary
Steel–concrete composite structural systems with shear connectors have excellent structural performance and economic feasibility, and have been employed in various fields for decades. Oguejiofor and Hosain [22,23,24] compared the behaviors of the perfobond rib shear and stud connectors by analyzing the differences in their failure modes in push-out and beam tests They proposed an equation for evaluating the strength of the perfobond rib shear connector by considering the tensile strength of concrete, amount of transverse rebar, and location of holes. To predict the shear strength of Y-type perfobond shear connectors, Kim et al [34,35,36] conducted push-out tests, beam tests, and numerical analysis and proposed shear resistance formulas by considering design variables. Structures, various design factors, such as the compressive strength of concrete, the height of the slab, and the diameter of the transverse rebar, must be considered To this end, the current study proposed the stubby Y-type perfobond rib shear connectors for composite frames, and experimentally examined their shear strength and ductility through push-out tests. Push-Out Tests of a Composite Structure Using Stubby Y-Type Perfobond Rib Shear Connectors
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