Experimental Evaluation of Strut-and-Tie Model of Anchorage Zone in Posttensioned Concrete Structures

摘要

This article presents a series of experimental investigations assuming the strut-and-tie model(STM) for anchorage zones in posttensioned concrete structures. The test design for concretesamples is based on finite element analysis for a prestressing process. For end anchorage specimens,the relative location of the reinforcement centroid with respect to the bursting force centerwas investigated. The test results indicate that the specimen with the coincident reinforcementcentroid shows the best performance in resisting the tension load. The presence of spiralreinforcement in the region below the bearing plate results in a redistribution of internal stressesin the anchorage zone. Therefore, Mörsch’s model should be refined by moving the STM configurationdown by a distance of a quarter of the anchor size. For the interior anchorage zone, the testresults confirm that the modified International Federation for Prestressing model offers a safe buteconomical STM scheme for the interior anchorage zone.