Anchor bonds of the contact joint of steel-concrete structures

Ribbed slabs, consisting of metal rib beams and a reinforced concrete monolithic slab, are often used. Because of the joint work of the reinforced concrete slab and steel ribs, such floors are called steel-reinforced concrete. The main elements that provide the joint work of the layers of ribs and plates in them are anchor ties. The set of design solutions for anchor ties used in the contact joints of steel-reinforced concrete structures is multifaceted. A comparative analysis of the variants of the structures of anchor connections shows that rod anchor connections have an advance in the manufacturability of the connection and the material consumption. Unlike bridge structures, stud bolts are often used as inclined clamps from smooth round bars or corrugated vertical reinforcing bars welded to the upper shelf of a steel rib. An analysis of various experimental studies shows that the anchor ties work in bending and tension. The research object was the stress-strain state of anchor rods. The numerical and experimental studies of the work of the steel-concrete contact joint on prism models were carried out. The work diagrams for three types of anchors are given. Numerical studies revealed a mosaic of stresses and strains in anchors. Based on the analysis of numerical and full-scale experiments, analytical dependencies are proposed that reflect the actual operation of anchor ties. Comparisons of the calculation results by analytical formulas and comparisons with numerical and full-scale experiment data are given. Numerical studies have revealed the pattern of the stress-strain state of the contact joint, the stages of development of cracks in the concrete flange, and the sequence of development of deformations in anchor ties. It was revealed that vertical anchor rods have an increased bearing capacity, although displacements are 1.5-2 times greater than those of loop-shaped anchor ties.

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