In the present paper the results of a finite element study of anchor channels and single headed anchors close to the free edge loaded in shear perpendicular and parallel to the edge (concrete edge failure) are discussed. For single headed…
In the present paper the results of a finite element study of anchor channels and single headed anchors close to the free edge loaded in shear perpendicular and parallel to the edge (concrete edge failure) are discussed. For single headed anchors experimental tests and numerical simulations have been performed to investigate the load bearing behavior under arbitrary shear load (Hofmann 2005, Grosser 2008). In case of a headed anchor subjected to a shear force parallel to the free edge the failure is initiated by a splitting force acting perpendicular to the edge. It is a fraction of the applied shear load. In order to account for the fact that a higher shear load acting parallel to the edge is required to cause concrete edge failure compared to a shear load acting perpendicular to the edge in the draft fib Design Guide (fib (2009)) the calculated concrete edge capacity valid for a shear load perpendicular to the edge is multiplied by an increase factor. This factor pri- marily depends on the pressure in front of the anchor. For anchor channels arranged perpendicular to the edge and subjected to a shear load applied parallel to the edge limited experimental investigations performed by Roik (2009) indicate that the increase factor is higher compared to headed anchors. The non-linear finite ele- ment program MASA was used to study the load bearing behavior of headed anchors and anchor channels loaded perpendicular and parallel to the edge. It was verified that for anchor channels the ratio failure load (shear load parallel to the edge) to failure load (shear load perpendicular to the edge) is larger than for headed anchors. This is explained by the significantly lower pressure on the concrete in front of the channel com- pared to headed anchors.