The posttensioning tendon anchorages in unbounded post tensioned building and bridge systems are important structural components because of the transfer of the entire post tensioning force at these locations. Post tensioning anchorage designs, configurations, manufacturing processes, and materials have significantly changed since the initial research that led to their development. All of this early work focused on structures under gravity loads, with no consideration for extreme loads such as earthquakes. As a potential limitation for seismic applications, premature strand wire fractures were observed by Weldon and Kurama during reversed-cyclic lateral load testing of unbounded post tensioned precast concrete coupled wall subassembly specimens. Subsequently, a detailed experimental study on the ultimate performance of industry representative standard strand-anchorage components from the United States was conducted by Walsh and Kurama. Recently, premature strand wire fractures were also ob- served during the shake-table testing of a precast concrete building system.