As evidenced in the measured behavior of the coupled wall
structure described in Weldon and Kurama,30 the strain
limit of 0.01 represents a real and practical limit for the
design of unbounded posttensioned structures in seismic
regions. Premature posttensioning anchorage failure, even
in the form of single wire fractures, can result in significant
reductions in the self-centering capability as well as in the
lateral stiffness and resistance of these structures under
seismic loading 0.30 The residual behavior (that is, stress
reduction through successive wire fractures) of mono-strand
anchorage systems beyond first wire fracture was recently
investigated by Sideris et al.