ANALYTICAL MODEL FOR PULLOUT AND SPLITTING FAILURES IN BAR ANCHORAGES AND LAPS

This paper presents a unified analytical method to predict the slip and tensile strength capacity of both straight anchorages and lap splices. Closed-form solutions of the slip at the loaded end of an anchorage or lap splice are derived based on a set of simplified bond stress distributions applicable for different geometrical and loading conditions. The model assumes a linear bond stress distribution along the elastic portion of the anchorage/splice, and a constant bond resistance within the region where the bar has yielded in tension. Closed-form solutions of the ultimate strength capacity of the anchorage/splice are also obtained by combining the proposed model with a simple bond failure criteria and the local bond strength specified in the 2010 Model Code. The proposed formulation is shown to predict with overall good accuracy the slip response of bar anchorage tests reported in the literature, including pullout failures, and the lap-splice strength of 457 test specimens from the ACI 408 database.