Abstract
The performance of base-isolated steel structures having special moment frames is assessed. The archetypes, which are designed per ASCE/SEI 7–2016, are simulated in the Finite Element (FE) computational platform, OpenSees. Adopting nonlinear dynamic analyses using far-field ground motions, the performance of Drift-Sensitive Structural Components (DS-SC), and Drift-/Acceleration-Sensitive Non-Structural Components (DS/AS NSC) at slight, moderate, extensive, and collapse damage states are investigated. The effects of structural height, effective transformed period (Teff), response modification coefficient (RI), and isolation type on the performance of 26 archetypes mounted on Lead Rubber Bearings (LRBs) and Triple Concave Friction Pendulums (TCFPs) are evaluated. Computing 50-year probability of exceedance using the fragility curves and seismic hazard curves of the site, increasing Teff reduces the role of RI in the structural performance; variations in the height, as well as RI, do not affect the risk of damages to the AS-NSC; the risk of collapse is not sensitive to the variations of Teff. The TCFP systems represent superior performance than LRB systems in lower intensities. For longer periods and taller structures, the isolation type has less effect on the performance of NSC. Finally, the archetypes have less than 1% risk of collapse in 50 years; nevertheless, high-rise structures with RI = 2.0 have more than 10% probability of collapse given the maximum earthquake.
Highlights
Isolation technology is considered as an effective seismic protective system in the field of earthquake engineering
Since the same trend is observed among the fragility curves, selective curves related to the models
Among the 22 Lead Rubber Bearings (LRBs) isolated systems, the system collapse is mainly controlled by the failure of the isolators and rarely by the collapse of the superstructure among low-rise and mid-rise archetypes
Summary
Isolation technology is considered as an effective seismic protective system in the field of earthquake engineering. Tajammolian et al [29] implemented the PBEE framework into the design investigation of TCFP isolated asymmetric structures, where the spectral acceleration reduces up to 20% in building damages using TCFPs. Recently, resilience-based earthquake design framework has attracted attention. Notwithstanding that the recent design standards consider risk-targeted approach in their design methodology [31,32], the effect of influential design parameters on the performance of codified seismically base-isolated structures has not been addressed yet. Should a performance evaluation methodology assess structural components and non-structural elements, which is the explicit target of a resilience-based design framework. The fragility curves and the 50-year probability of exceedance, which is computed by integrating each fragility curve over the site hazard curve, are compared in different DSs for (non-)structural components
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