In the absence of a formal national standard, the Recommendations of the PostrnTensioning Institute (1996) have served the dam industry well regarding the design,rnconstruction, testing, and performance of rock anchors. These Recommendations are beingrnupdated again in 2003, with special emphasis being devoted to the results of recentrnresearches into issues related to epoxy protected strand. Recently, the author has beenrninvolved in the performance assessment of high capacity anchors installed in a dam in thernPacific Northwest in 1975. Very comprehensive contemporary records exist from the project,rninvolving multiwire wire tendons. These records clearly illustrate the “State of Practice” as itrnwas for anchors at the time. This paper compares and contrasts these historical data withrncontemporary practices, illustrating the evolution of certain aspects of dam anchor practice inrnthe U.S. over three decades.
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