Single Column Test - Test #8 - Hybrid Simulation through Collapse of a 1:8 Scale Exterior Steel Column Physical Substructure in a 20-Story Analytical Steel Moment Resisting Frame- MODIFIED COLLAPSE TEST

In this study, two hybrid simulations were conducted in which a 1:8 scaled W36x652 exterior column that is part of a 20-story steel moment resisting frame was considered as the physical substructure. The three-actuator setup (small bearing machine) at NEES@ Buffalo laboratory was utilized. In the current test, the nonlinear time history analyses using the modified-coupled model (a model in which the physical specimen that forms part of the hybrid architecture is also modeled numerically using OpenSees) was modified according to the experimental data achiveved from the origonal hybrid test showed that the onset of dynamic instability was achieved when a scale factor of 2.7 was applied to the Duzce record.
The most relevant lessons learned from this study are threefold. First, the results reinforced the need to further investigate the response of deep steel columns to provide data useful for model calibration and improved numerical collapse predictions of structural systems. Second, it was demonstrated that hybrid simulations up to collapse could be very sensitive to the properties assigned to the numerical portion of the structure. Third, it was shown that the proposed hybrid substructuring technique and displacement-control approach implemented in this study were successful in tracing the behavior of a tall steel structure until the onset of global instability was approached.