000015727 001__ 15727
000015727 005__ 20161115135328.0
000015727 04107 $$aeng
000015727 046__ $$k2013-06-12
000015727 100__ $$aAhmadi, O.
000015727 24500 $$aCollapse Resistance of Seismically Resilient Self-Centering Steel Moment Resisting Frame Systems

000015727 24630 $$n34.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000015727 260__ $$bNational Technical University of Athens, 2013
000015727 506__ $$arestricted
000015727 520__ $$2eng$$aA self-centering moment resisting frame (SC-MRF) is a viable alternative to a conventional MRF with welded beam-column connections for seismic resistant steel frame buildings. An SC-MRF is characterized by gap opening and closing at the beam-column interface under earthquake loading. The beams are post-tensioned to columns by high strength post-tensioning (PT) strands oriented horizontally to provide self-centering forces when gap opening occurs. For the SC-MRF investigated in this research, energy dissipation is provided by beam web friction devices (WFDs) attached to the columns at the beam-column interface. The SC-MRF is a highly resilient system where typically it is designed to meet several seismic performance objectives. These include no damage under the Design Basis Earthquake (DBE), leading to immediate occupancy performance following the DBE. In addition, under the Maximum Considered Earthquake (MCE) the structure is designed to have minimal damage. Prior analytical and experimental research has shown that a SC-MRF can achieve these performance objectives. The design procedure for SC-MRFs uses global seismic performance factors (SPFs) that include the response modification factor (R), the system overstrength factor (Ω0), and deflection amplification factor (Cd). Since this system is new, little is known about the collapse resistance of this type of structural system under seismic ground motions. For an SC-MRF to be accepted in practice, the global SPFs need to be evaluated in accordance with FEMA P695 to establish whether the collapse margin ratio for such a structural system under extreme ground motions is adequate. In this paper incremental dynamic analyses are presented and the probabilistic collapse resistance of SC-MRFs is assessed. The model of the SC-MRF is a hybrid model that combines stress-resultant elements with continuum elements in order to enable complete structural systems to be modeled while capturing the important limit states that can occur, including gap opening at the beam-to-column interface, yielding of PT strands, second order (P-delta) effects due to gravity loads imposed on the gravity load frames, and cyclic local buckling and strength degradation in the beam plastic hinge regions of the SC-MRF. The model of the SC-MRF is presented, along with the incremental dynamic analysis procedure and results. The sensitivity of seismic collapse to design parameters (values of SPFs, post-tensioning force level, design story drift, energy dissipation) is presented, and the implications on design discussed.

000015727 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000015727 653__ $$a

000015727 7112_ $$aCOMPDYN 2013 - 4th International Thematic Conference$$cIsland of Kos (GR)$$d2013-06-12 / 2013-06-14$$gCOMPDYN2013
000015727 720__ $$aAhmadi, O.$$iRicles, J.$$iSause, R.
000015727 8560_ $$ffischerc@itam.cas.cz
000015727 8564_ $$s32680$$uhttps://invenio.itam.cas.cz/record/15727/files/1338.pdf$$yOriginal version of the author's contribution as presented on CD, section: CD-MS 22 ADVANCES IN COMPUTATIONAL METHODS FOR RESILIENT STRUCTURAL SYSTEMS UNDER EXTREME HAZARDS
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000015727 962__ $$r15525
000015727 980__ $$aPAPER