  This contribution studies a well-known failure criterion and its application
to the life-time prediction of adhesive anchor systems under sustained load.
The Monkman-Grant relation, which has previously been applied to a wide range
of materials, is now applied to adhesive anchors installed in concrete. It
postulates a linear relationship between the logarithm of stable creep rate and
time to failure. In this paper the criterion is evaluated first on a large
experimental campaign on one concrete involving two chemically different
adhesives and then by several experimental data sets reported in literature. In
all cases the data is well represented and highly accurate predictions are
obtained. The second part of the paper focuses on the relationship between
stable creep rate and relative load level of the remote constant stress based
on the Norton-Bailey and the Prandtl-Garofalo creep laws. The latter was found
to perform better on fitting the experimental data. Finally, the combination of
the Monkman-Grant criterion and the aforementioned creep laws allows the
prediction of stress versus time to failure curves including uncertainty
bounds, that are in very good agreement with all experimental data sets, making
it an interesting alternative to existing test methods for adhesive anchor
systems under sustained loads.
