Abstract
The presented study deals with steel bolts for concrete subjected to impact loading. Impact loading induced by the Schmidt hammer was used to assess the quality of bond between the anchor bolt and the surrounding concrete. The effect of impact loading on the load-carrying capacity of 8, 10 and 12 mm diameter bolts with a constant embedment length and concrete strength was studied. Concrete quality, anchor alignment, diameter and water ingress were also taken into consideration. An analytical model is presented which takes into account the interfacial bonding between the bolt and surrounding concrete matrix, bolt geometric shape, diameter, alignment and embedment length. The comparisons between theoretical and experimental results revealed that the analytical model was capable to predict the maximum load carrying capacity and pull-out mechanism of the anchor bolts. From the presented results and discussion, it was found that the bond performance of the bolts and hidden defects can be identified by imparting impact energy. The proposed model can be used by engineers and researchers to judge the quality of the bond between bolt and surrounding concrete and for predicting their peak load carrying capacity and displacement of various types of anchor bolts.