■ بررسی و تحلیل اثر واکنش سنگدانه های قلیایی در سدهای قوسی

Dan D. Curtis
Acres International, 4342 Queen Street, P.O. Box 1001
Niagara Falls, ON, Canada L2E 6W1

ABSTRACT
A review of the effects of alkali-aggregate reaction (AAR) in arch dams is presented.
Numerous arch dams in the United States, Africa, Portugal and Spain have AAR and this paper
presents a summary of observed/measured behavior of the dams.
From the review, it is shown that arch dams can experience relatively large deformations and
the displacement pattern is quite unique. A detailed finite element analysis of a typical arch
dam is undertaken to demonstrate the mechanisms of behavior. From the analysis, it is shown
that the stress-dependent behavior of AAR concrete expansion is a very important
consideration for the proper analysis of arch dams. For example, an analysis which neglects
the stress-dependent nature of concrete growth will significantly over-estimate the amount of
tension in the dam. In addition, the unique displacement pattern of an arch dam with AAR is
well matched by a finite element analysis which includes the stress dependent concrete growth
behavior.

Keywords: AAR, alkali-aggregate reaction, arch dam, finite element analysis, stressdependent.