Tensile Strength of Expansion Anchors installed in Uncracked and Unreinforced Concrete

抄録

This paper presents an evaluation of the tensile strength of an expansion anchor whose anchorage design can cause a fracture on concrete. Tests of heavy-duty anchor and wedge anchor, domestically manufactured and installed in a plain concrete member, were conducted to test the effects of embedment depth and edge distance. A design of post-installed steel anchors termed as the Concrete Capacity Design (CCD) approach, is presented. This approach is compared to the well-known provision, ACI 349-90. The two methods are compared in terms of their effectiveness in predicting the concrete fracture load of an expansion anchor in plain concrete under monotonic loading for important applications. Based on the results of the experiments, for the CCD method, a normalization coefficient of 10.5 is appropriate for the nominal concrete breakout strength of an anchor or group of anchors in tension.