NEESR-SG: Self-Centering Damage-Free Seismic-Resistant Steel Frame Systems SC-MRF Hybrid Simulation for High-Level MCE

The earthquake input for this simulation will produce the high-level maximum considered earthquake (i.e., MCE, with 2% probability of exceedance in 50 years) response. The input ground motion is the STM090 record from the 1994 Northridge event, scaled by 2.071. The high-level MCE simulation will cause minor yielding in the columns at the base of the first, second and third stories, yielding of the roof beams, a small reduction in the post-tensioning forces, and a small residual drift. The roof drift will be approximately 4.6% radians.

The 4-story, 2-bay self-centering (SC) moment-resisting frame (MRF) test structure is based on a prototype structure designed for a site in Van Nuys, California. The test structure has been subjected to numerous previous laboratory tests, including several median-level frequently occurring earthquake (i.e., FOE, with 50% probability of exceedance in 50 years) hybrid simulations, two low-level DBE hybrid simulations, one median-level DBE hybrid simulation, one high-level DBE hybrid simulation, one high-level DBE/median MCE hybrid simulation, one median-level MCE hybrid simulation, and one aftershock hybrid simulation. From these previous laboratory tests, the SC-MRF test structure has no significant residual drift, minor yielding in the columns at the base of the first story, and only a small reduction in post-tensioning forces from the DBE-level and aftershock simulations, as well as the minor damage identified above from the MCE-level simulation.