000012285 001__ 12285
000012285 005__ 20141205160038.0
000012285 04107 $$aeng
000012285 046__ $$k2008-10-12
000012285 100__ $$aZhang, Jian
000012285 24500 $$aOptimum Isolation Design for Highway Bridges Using Fragility Function Method

000012285 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000012285 260__ $$b
000012285 506__ $$arestricted
000012285 520__ $$2eng$$aSeismic isolation can be used to improve the seismic response and reduce damages of bridges. This paper aims to use the performance-based evaluation approach to investigate the performance of highway bridges with base isolation. Fragility functions are derived for typical base-isolated highway bridges using a simplified two dimensional numerical model representing the transverse response of bridges. The nonlinear models for piers and isolation devices are incorporated and various combinations of isolation parameters, e.g. elastic stiffness, characteristic strength and post-yielding stiffness representing common types of isolation devices are evaluated. Fragility curves are derived based on nonlinear time history analyses using a suite of 250 recorded earthquake motions in California. Damage criteria for both pier and isolation device are established to relate the response quantities to damage index of the bridge. The derived fragility functions define the probability of exceeding a predefined performance state at varying levels of earthquake intensity. By evaluating the earthquake intensity required to achieve specified damage states of base-isolated bridges, the optimum parameters of isolation devices are identified as function of structural properties. The study shows that the mechanical properties of isolation devices play an important role to the bridge response. The fragility function method provides an effective way to achieve the optimum design to minimize the damaging potential of bridges while incorporating the uncertainties in ground motions and variability of structural properties.

000012285 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000012285 653__ $$abridge, isolation, fragility function, optimal parameter, efficiency

000012285 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000012285 720__ $$aZhang, Jian$$iHuo, Yili
000012285 8560_ $$ffischerc@itam.cas.cz
000012285 8564_ $$s1363392$$uhttp://invenio.itam.cas.cz/record/12285/files/11-0121.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 11-0121.
000012285 962__ $$r9324
000012285 980__ $$aPAPER