Modeling of dowel action for cast-in and post-installed anchors considering bond property

Abstract

In reinforced concrete structures, cast-in anchors are applied to beam–column or slab–beam joints. Furthermore, in seismically strengthened structures, post-installed anchors are used to connect new members to existing members. These anchors are subjected to shear and tensile stresses during an earthquake. However, a mechanical model that can estimate the behavior of these anchors when subjected to combined stress has not yet been proposed. Therefore, in this study, various anchors were tested under combined stress conditions. The test parameters were the type of anchorage method, shape of anchor bolt, anchorage length, hole diameter of the drilling, type of adhesive, and tensile stress ratio. It was observed that the shear force of the post-installed anchors was larger than that of the cast-in anchors. Moreover, as the diameter of the hole increased, the shear force also increased. Subsequently, the mechanical model, which was proposed for a post-installed anchor in a previous study, was modified for application to various anchors. By considering the diameter of the hole in the bearing resistance and introducing the bond strength to catenary action, the test results of the various anchors could be reasonably estimated.