Bearing capacity of pasted anchors in the masonry walls of natural limestone

The joint work of pasted steel anchors and wall masonry elements from natural limestone is discussed in the article. The aim of the scientific work is the development of a technique for calculating the load-bearing capacity of anchors in masonry walls from natural limestone and the development of nomograms for the rapid evaluation of the bearing capacity of anchors. The state of the problem of the work of pasted anchors in various materials was studied. It is established that the known methods for calculating the strength of pasted steel anchors do not take into account the joint work of the natural limestone and pasted steel anchor. Previous studies have focused on the study of anchor joints in concrete, and the work of the pasted joint in the masonry walls of natural limestone has not been investigated. In the present work, for the experimental study of the work of pasted steel anchors in the masonry of walls made of natural limestone, the following materials were accepted: natural limestone, periodic profile reinforcement and anchor mixture. General methods of experimental and theoretical research: analysis, synthesis, deduction, induction, analogy. To solve the set tasks, in the experimental part, the strength of the adhesive joint for pulling in stone elements after the strength of the anchor mixture was established, when fitting the fixture ø 12 mm А 500С into it. Experimental samples, tested to determine the strength of the adhesive joint, were destroyed by breaking the stone. This fact confirms the higher strength of the adhesive bond than the stone element. The results of the physical experiment performed by the authors for determining the parameters of the joint work of the pasted steel anchor and the stone elements from natural limestone are presented in article. It has been experimentally established that 0.4 mm is the criterion for the limiting displacement of anchors, in which splitting of stones from the effect of transverse tensile stresses caused by pulling out pasted steel anchors is not allowed. The estimated evaluation of the joint work of pasted steel anchors and wall masonry elements from natural limestone was proposed.