This report summarizes the enhanced modeling and analysis capabilities
of the IDARC program series for analysis, design and support of
experimental studies. The analytical models described include frame
structures with rigid or semi-rigid connections made of beams,
columns, shear walls, connecting beams, edge elements, infill masonry
panels, inelastic discrete springs (connectors), and damping braces
(viscoelastic, viscous, friction and hysteretic). Hysteretic models
with improved degradation parameters can trace sections to complete
collapse. The nonlinear characteristics of the analytical models are
based on a flexibility formulation and an improved distributed
plasticity with yield penetration model. Properties of members are
calculated by fiber models or by formulations based on mechanics. The
analysis techniques include improved nonlinear static analysis (with
monotonic and cyclic loadings), nonlinear dynamic analysis with
multi-component ground motions and gravity loads, and quasi-static
analysis of the type required by laboratory experiments. The analyses
include enhanced evaluation of inelastic response through damage
analysis of members and the global structure, using methods based on
energy, stiffness and ductility including monitored damage
progression. Finally, new case studies are included as examples of use
of inelastic analyses.