An Exploratory Photoelastic Investigation of Post-Tensioned Concrete Anchorage Zone Bursting Stresses.

摘要

The use of post-tensioning prestressed concrete members is becoming increasingly popular in the United States. Problems have arisen in the design of the anchorage zones of these members, however, as the post-tensioning force has caused cracking in several instances. The anchorage zone itself is a complicated stress region influenced by many different factors. While there have been numerous analytical studies of the stresses present in the anchorage zone, a general lack of insight into the nature of stresses present and the influence of various parameters on their distribution persists. The exploratory investigation reported herein was undertaken to more closely examine the stresses found in the anchorage zone, utilizing the analysis method of photoelasticity. The investigation was to design an appropriate photoelastic model, develop appropriate testing procedures, and then conduct a series of tests varying anchorage zone parameters to determine their influence on the stresses created in the anchorage zone.