000010303 001__ 10303
000010303 005__ 20141205155712.0
000010303 04107 $$aeng
000010303 046__ $$k2008-10-12
000010303 100__ $$aHussain, Saif
000010303 24500 $$aDesign of a Seismic Isolation System with Supplemental Viscous Damping for a Near-Fault Essential Services Facility

000010303 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000010303 260__ $$b
000010303 506__ $$arestricted
000010303 520__ $$2eng$$aThe subject building is the L.A. Regional Transportation Management Center. This steel building encloses five floors comprising about 88,000 square-feet. As an essential service facility it meets the Seismic Performance criteria of "Immediate Occupancy" after a Maximum Considered Earthquake (MCE). Located within proximity of large active faults (closest at 400 feet), the facility can be subjected to high-velocity pulse-type ground motion. Conventional Base-Isolation utilizing different types of isolators would need to accommodate an impractical 40” of lateral displacement. A supplemental viscous fluid damping (VFD) system was selected combined with Natural Rubber Bearings isolators selected for their reliability, consistency of properties over time, cost effectiveness, wide availability and ease of modeling. Sixteen 320 kip nonlinear VFDs reduce the maximum lateral displacement to 24” without adding elastic stiffness to the system. Due to the low initial stiffness of the natural rubber isolators and low initial sticking force in the VFDs, an innovative wind-brake ring with adjustable tension bolts was added to the dampers to achieve the code required wind load resistance. The considerably lower tension capacity of the isolators compared to compression capacities created challenges when resisting seismic over turning forces. Double end bay spans were created and braced frames utilized as transfer trusses to concentrate dead loads at corners to minimize the upward displacement and isolator tension. Modeling this behavior for isolators was also a challenge. A creative technique was devised utilizing a combination of three finite elements, namely; a bilinear biaxial (horizontal) shear hysteretic element with linear axial (vertical) stiffness combined with a uniaxial gap element connected by a rigid link. Four elements were used at damper locations.

000010303 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
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000010303 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000010303 720__ $$aHussain, Saif$$iAl Satari, Mohamed
000010303 8560_ $$ffischerc@itam.cas.cz
000010303 8564_ $$s1369978$$uhttps://invenio.itam.cas.cz/record/10303/files/S05-02-007.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: S05-02-007.
000010303 962__ $$r9324
000010303 980__ $$aPAPER