NEHRP Clearinghouse

IDARC2D Version 7.0: A Program for the Inelastic Damage Analysis of Structures (MCEER-09-0006).
Reinhorn, A. M.; Roh, H.; Sivaselvan, M.; Kunnath, S. K.; Valles, R. E.; Madan, A.; Lobo, R.; Park, Y. J.
National Science Foundation, Arlington, VA. Earthquake Engineering Research Centers Program., July 28, 2009, 410 p.
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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.
; Panels; Earthquake damage; Buildings; Computer programs; Connectors; Damage assessment; Structural vibration; Vibration damping; Walls; Seismic effects; Inelastic stress; Columns (Supports); Framed structures; Nonlinear systems; Beams (Structural); Dynamic structural analysis