Analytical Modeling of Moderately Ductile RC Frame Structures for Seismic Performance Evaluation Using PERFORM-3D

Performance-based vulnerability assessment of buildings requires dynamic inelastic analysis, which cannot be conducted without reliable analytical models. An important aspect of analytical building models involves hysteretic modeling of force-deformation relationships. PERFORM-3D software was used to generate fragility curves for moderately ductile buildings in Eastern Canada using hysteretic models with different features reflecting the recommendations of different North American standards. Two-story and five-story reinforced concrete (RC) frame buildings were considered for this purpose. The parameters that define rotational limits, as specified in ASCE 41-13 and ACI 369R-11 as well as the National Building Code of Canada (NBCC), were assessed. The results indicate that the variations in modeling parameters did not result in significant differences in fragility response at immediate occupancy and life safety performance levels, whereas the fragilities at the collapse performance level were affected. The probability of exceeding collapse prevention in buildings modeled as per NBCC was higher than those modeled using the ASCE 41-13 and ACI 369R-11 requirements.