Abstract
In order to achieve a kind of shear connector suitable for rapid-assembling steel-concrete composite beams, a new type of hybrid shear connectors is proposed, in which the concrete slab with prefabricated circular holes and the steel beam with welded studs are installed and positioned, and then epoxy mortar is filled in the prefabricated hole to fix the studs. To study the mechanical behavior of these hybrid connectors, test on 18 push-out specimens with different prefabricated circular holes are carried out. ABAQUS finite element software is adopted to verify the relationship between the numerical simulation and experiment, influences of the epoxy mortar strength and prefabricated circular holes diameter are studied. The results show that filling epoxy mortar in the prefabricated hole is beneficial to improve the stiffness and bearing capacity of the specimen; the change of epoxy mortar strength has a certain impact on the bearing capacity and stiffness of the hybrid connector; In the case of the same strength of the filling material, the size of the prefabricated circular holes diameter directly affects the stiffness and bearing capacity of the shear stud. The shear capacity equations proposed by considering the epoxy mortar strength and prefabricated holes diameter, and it has a wide applicability.
Highlights
Steel-concrete composite structures take advantages of using steel and concrete materials
The results showed that the connection between the steel girder and the concrete slab ensured by epoxy adhesive is perfect and without any slip in the steel–concrete interface
The transverse component PL is mainly caused by the bending deformation of the stud, which leads to the separation of the concrete slab and the steel beam; the vertical component PV is the shear force caused by the slip between the concrete slab and the steel beam, which produces the diffusive angle during the transfer of the concrete slab and the transverse tensile force Tsplit, causes the cracking of the concrete slab in front of the stud
Summary
Steel-concrete composite structures take advantages of using steel and concrete materials. The first experiment on the bonded composite beams was carried out in 1962, Miklofsky et al [4] compared a bonded composite beams with the mixed composite beams connected by the shear steel studs These beams were prepared by directly depositing the fresh concrete on the epoxy adhesive, not hardened, on the steel beam surface. His testing results showed that the ruin of the mixed composite beam occurred by the crushing of the concrete, whereas the ruin of the bonded composite beams occurred due to the debonding failure of adhesive connection. At the beginning of the 1970s, Hick and Baar [5] explored the bonded composite beams with surface treatment on the steel and concrete surfaces For their system, the structural failure occurred due to shearing in the concrete slab near the adhesive joint. The mechanical properties of the interface of hybrid connectors need to be further studied
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