Enhancements to Program IDARC: Modeling Inelastic Behavior of Welded Connections in Steel Moment-Resisting Frames.
Enhancements to Program IDARC: Modeling Inelastic
Behavior of Welded Connections in Steel Moment-Resisting
Kunnath, S. K.
NIST GCR 95-673; 73 p. May 1995.
Sponsor:National Institute of Standards and Technology,
Available from: National Technical Information Service
Order number: PB95-231601
computer program; earthquakes flexibility formulations;
hysteresis; modeling; steel frames; weld fracture
An existing computer code, IDARC, is enhanced to permit
the modeling of steel moment resisting frames (SMRFs)
with the potential for weld failures at beam-to-column
connections. The steel member model is derived from
flexibility formulations in order to allow complex
degrading hysteresis behavior to be incorporated. A
panel zone element is developed to account for inelastic
shear deformations in the beam-to-column connection
region. Finally, a new conceptual hysteresis model is
developed to represent the force-deformation
characteristics at a welded connection, before and after
weld failure. The new models were validated using
experimental data from available component tests and an
existing computer program, DRAIN-2DX. The results of
the study indicate that the enhanced program, referred
to as IDASS, is capable of adequately reproducing
observed behavior of SMRFs and can be used as an
effective tool to investigate the effects of weld
failure in steel structures under earthquake loading.