Abstract
Reinforced concrete floors and steel beams are widely used in buildings and structures for various purposes. Reinforced concrete overlaps can be cast-in or precast of hollow-core slabs. The most effective floors in which the concrete slab is located in the compressed area of cross-section, in steel beams in the tension zone, and shifting forces, arising between concrete slab and the steel beam, are perceived by anchors. Precast slabs in comparison with cast-in ones have less labor-intensive performance, the beam spacing is equal to the span of reinforced concrete slabs, there are no intermediate beams in such overlaps, that allows to reduce the floor thickness. The inclusion of precast in steel-concrete cross-section requires joints with steel beams, which requires using of special anchors. Anchor perceives shear forces and ensures the joint operation of the plate and the steel beam. In addition, for beams with narrow flange, the anchor device can provide the required width of the support slabs. The calculation of the attachment points of the anchors to the steel beam is carried out using three variants of calculation methods, which allow to determine the forces acting on the anchor. For practical application, a wire-element model has been proposed and managed to get forces in a steel beam, slab and anchors the width of the slab recommended by the standards should be included in the calculation model.
Highlights
The behavior of the composite structure differs from the behavior of steel or reinforced concrete construction due to the presence of shear anchors[1]
In cast-in overlaps anchors are made of stud bolts, that are welded to the upper flange of a steel beam
With a small width of the upper flange of the beam, it is not always possible to place stud bolts between the ends of the plates and it is more rationally arrange the anchors in the joints of the plates, which include in the joint work with the beam, and provide the required width of slab bearing on the beam
Summary
The behavior of the composite structure differs from the behavior of steel or reinforced concrete construction due to the presence of shear anchors[1]. In cast-in overlaps anchors are made of stud bolts, that are welded to the upper flange of a steel beam. The calculation of the composite structure with anchors in the form of stud-bolts and its tests are considered in [2, 3, 4, 5]. The calculation of connection of the slab with a steel beam in the form of stud bolts in case of fire and constructive measures to improve their fire resistance are considered in [6]. During constructing overlaps by using precast concrete slabs, the design of anchor should be chosen taking into account the required width of the slabs bearing on the beam. With a small width of the upper flange of the beam, it is not always possible to place stud bolts between the ends of the plates and it is more rationally arrange the anchors in the joints of the plates, which include in the joint work with the beam, and provide the required width of slab bearing on the beam (figure 1)
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