Impact of assembly parameters on the resistance of steel anchors

Abstract

In the current research practice, there is no documented influence of factors on load-bearing resistance and durability of joints by using steel anchors fasteners for fastening structural elements. The basic factors that may affect the load resistance are in particularvarious assembly parameters of steel anchors/connectors, the condition of the substrate (possible cracks), the grain size of concrete substrates, and additional reinforcement in the form of dispersed admixtures. The work determines changes in the load-bearing resistance of M12 steel anchors, depending on the anchorage depth used and the tightening/installation torque applied. The tests were carried out on cracked and non-cracked C20/25 concrete substrates. As part of the load resistance analysis, the correction coefficients of the load capacity of pulling-out of the steel anchors, which can correct the design loadings for pulling out of concrete substrates in the C20/25 ÷ C50/60 class range and correlations of these resistance, were determined. Two types of steel anchors: ring and sleeve on diameter M12 were selected for the tests, as commonly used structures of steel anchors in the construction industry. The article presents the results of tests for specific pull-out resistances of steel anchors installed in concrete. All tests were carried out for the purposes of this paper at normal temperature, without factoring in influence of concrete or air moisture content.