The new microplane model developed in the preceding companion paper is
calibrated and verified by comparison with test data. A new approxima
te method is proposed for data delocalization, i.e., decontamination o
f laboratory test data afflicted by localization of strain-softening d
amage and size effect. This method, applicable more generally to any t
ype of constitutive model, is based on the series-coupling model and o
n the size-effect law proposed by Bazant. An effective and simplified
method of material parameter identification, exploiting affinity trans
formations of stress-strain curves, is also given. Only five parameter
s need to be adjusted if a complete set of uniaxial, biaxial, and tria
xial test data is available, and two of them can be determined separat
ely in advance from the volumetric compression curve. If the data are
limited, fewer parameters need to be adjusted. The parameters are form
ulated in such a manner that two of them represent scaling by affinity
transformation. Normally only these two parameters need to be adjuste
d, which can be done by simple closed-form formulas. The new model all
ows good fit of all the basic types of uniaxial, biaxial, and triaxial
test data for concrete.