000011050 001__ 11050
000011050 005__ 20141205155830.0
000011050 04107 $$aeng
000011050 046__ $$k2008-10-12
000011050 100__ $$aMorgan, Troy A.
000011050 24500 $$aThe Optimization of Multi-Stage Friction Pendulum Isolators for Loss Mitigation Considering a Range of Seismic Hazard

000011050 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000011050 260__ $$b
000011050 506__ $$arestricted
000011050 520__ $$2eng$$aAn objective in the design of seismically isolated structures is the selection of bearing properties so that optimal performance is achieved over a range of excitations and performance metrics. A challenge in the design of isolation systems is that, to withstand very severe or near-fault motions, bearings often become so large, stiff and strong that they provide little isolation during moderate seismic events. Experimental and numerical investigations are presented to characterize a new multi-stage friction pendulum (FP) isolation bearing, capable of progressively exhibiting different hysteretic properties at various levels of displacement demand. This newly-developed triple pendulum isolator incorporates four concave surfaces and three independent pendulum mechanisms. Through the selection of geometric quantities such as spherical surface radii and slider height, combined with specification of friction coefficients for each interface, pendulum stages can be set to address specific response criteria for moderate, severe and very severe events. The feasibility of targeting these properties to achieve specific performance goals for a range of ground motion intensities and structural dynamic characteristics is investigated. In particular, the tradeoff between limiting very rare isolator displacement demands and inducing high-frequency floor accelerations and inter-story drifts is examined for a range of levels of seismic hazard. Nonlinear dynamic analyses of realistic building systems are presented, including a thorough, probabilistic description of key structural demand parameters suitable for reliability analysis and loss estimation. Recommendations for a design methodology leading to optimal parameters for multi-stage FP bearings given a particular super-structural system and seismic hazard environment are presented. This optimization procedure targets the minimization of loss estimates for over seismic events having a range of mean annual frequencies.

000011050 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000011050 653__ $$aSeismic isolation, friction pendulum, performance-based design

000011050 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000011050 720__ $$aMorgan, Troy A.$$iMahin, Stephen A.
000011050 8560_ $$ffischerc@itam.cas.cz
000011050 8564_ $$s150937$$uhttps://invenio.itam.cas.cz/record/11050/files/11-0070.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 11-0070.
000011050 962__ $$r9324
000011050 980__ $$aPAPER