000022058 001__ 22058
000022058 005__ 20170622145954.0
000022058 04107 $$aeng
000022058 046__ $$k2015-05-25
000022058 100__ $$aLee, Tzu-Ying
000022058 24500 $$aANALYSIS AND EXPERIMENT OF ISOLATED BRIDGES USING POLYNOMIAL ROCKING BEARINGS

000022058 24630 $$n5.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000022058 260__ $$bNational Technical University of Athens, 2015
000022058 506__ $$arestricted
000022058 520__ $$2eng$$aThis paper is aimed to study the effectiveness of Polynomial Rocking Bearing (PRB), a various-frequency sliding isolator, in decreasing the seismic responses of isolated bridges. Although sliding isolators have been widely used to mitigate seismic hazard, it may be not effective in decreasing the seismic responses of isolated structures subjected to nearfield ground motions. Near-field ground motions are of a pulse period which may be close to the natural periods of the isolated structures so as to lead the isolated structures to be resonant. Various-frequency sliding isolators could regulate the natural periods of the structures to avoid resonance under near-field ground motions. However, the key issue is how to choose the geometric shape and friction materials in design of various-frequency sliding isolators. This study adopts PRB to be the various-frequency sliding isolator whose rocking surface consisting of six-order polynomial. The restoring stiffness of the PRB possesses softening section as well as hardening section. The structural acceleration response can be decreased by decreasing the restoring stiffness in softening section while the structural displacement response can be decreased by increasing the restoring stiffness in hardening section. Since the PRB equivalent horizontal friction coefficient can be adjusted via the various geometric shapes, the friction material can be then arbitrarily chosen to increase the bearing reliability and durability. PSO-SA hybrid algorithm is used to find out the optimum parameters of the PRB in this study. A series of shaking table tests are conducted to demonstrate the effectiveness of the PRB in mitigating the dynamic responses of bridges under strong earthquakes. Numerical analysis is also performed to make comparison with the experiments. It shows the numerical results agree with the experimental results very well.

000022058 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000022058 653__ $$aVariable-Curvature Seismic Isolator, Various-Frequency Seismic Isolator, Rocking Isolator, Near-Field Ground Motion, Shaking Table Test.

000022058 7112_ $$aCOMPDYN 2015 - 5th International Thematic Conference$$cCrete (GR)$$d2015-05-25 / 2015-05-27$$gCOMPDYN2015
000022058 720__ $$aLee, Tzu-Ying$$iChung, Kun-Jun$$iTzeng, Jing-Hung$$iLu, Lyan-Ywan
000022058 8560_ $$ffischerc@itam.cas.cz
000022058 8564_ $$s2536924$$uhttps://invenio.itam.cas.cz/record/22058/files/C1095.pdf$$yOriginal version of the author's contribution as presented on CD, section: 
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000022058 962__ $$r22030
000022058 980__ $$aPAPER