000019384 001__ 19384
000019384 005__ 20170118182316.0
000019384 04107 $$aeng
000019384 046__ $$k2017-01-09
000019384 100__ $$aHoulahan, Gerrald
000019384 24500 $$aNonlinear Time History Analysis for Assessment of An Existing Offshore Jacket Platform

000019384 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019384 260__ $$b
000019384 506__ $$arestricted
000019384 520__ $$2eng$$aIt is often necessary to reassess the seismic performance of existing platforms due to changes to platform deck loading, increase in number of well conductors, or because modern characterizations of earthquakes result in more severe ground motions than were considered at the time of the design of existing platforms (20-30 years ago). The primary goal of seismic reassessment of an existing platform is to assure that the platform system will have sufficient strength and ductility to withstand the Ductility Level Earthquake (DLE) without collapsing, although structural damage may occur. For this study an existing jacket platform off the coast of California was selected. The seismic analyses were based on new design response spectra and three sets of conforming ground motions for the 1000-year DEL. They were developed using the New Generation of Attenuation Relationships considering the influence of near-source and rupture directivity effects. Ground motions were developed for non-liquefied and liquefied conditions. The seismic assessment was carried out in three phases. The first phase of the study focused on the assessment of the foundation of the platform for the new DLE ground motions. Sensitivity analyses were undertaken to determine the effect on the platform’s response to variations in key parameters such as liquefaction and, structural and soil damping. The second phase assessed the platform with an additional 18 conductors. In the final phase of the study, analyses were conducted to determine the Reserve Strength Ratio (RSR) by assessing the sensitivity of the structure and its foundation to the intensity of the motions and to soil capacity. The results of the analyses are presented in this paper.

000019384 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019384 653__ $$aoffshore platform, seismic evaluation, nonlinear time history, analysis, reserve capacity

000019384 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019384 720__ $$aHoulahan, Gerrald$$iMeloney, Ingrid$$iBozorgzadeh, Azadeh$$iFury, Gavin
000019384 8560_ $$ffischerc@itam.cas.cz
000019384 8564_ $$s306977$$uhttp://invenio.itam.cas.cz/record/19384/files/3524.pdf$$yOriginal version of the author's contribution as presented on USB, paper 3524.
000019384 962__ $$r16048
000019384 980__ $$aPAPER