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NEESR-SG: Self-Centering Damage-Free Seismic-Resistant Steel Frame Systems SC-MRF Hybrid Simulation for Aftershock
The RTMD facility will be performing an Aftershock hybrid simulation on October 31, 2008, beginning at 11am, EDT.
Please visit the project webpage and the NEEScentral activities sites for more details.
This simulation represents an aftershock following an earthquake that produced the median-level maximum considered earthquake (i.e., MCE, with 2% probability of exceedance in 50 years) response. The input ground motion is the SJTE315 record from the 1989 Loma Prieta event, scaled by -2.234. The response to the aftershock will be equivalent to the median-level design basis earthquake (DBE) response. No significant yielding is expected in the beams and columns and no other damage is expected. The maximum story drift will be approximately 2.9 % radians. The prior median-level MCE simulation caused minor yielding in the columns at the base of the first story and in the 3^rd floor beams, more extensive yielding of the roof beams, small reductions in the post-tensioning forces, and small residual drift.
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, and one median-level MCE 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 small reductions in post-tensioning forces from the DBE-level simulations, as well as the damage identified above from the MCE-level simulation.
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