000022398 001__ 22398
000022398 005__ 20170622150012.0
000022398 04107 $$aeng
000022398 046__ $$k2015-05-25
000022398 100__ $$aDimitrakopoulos, Elias
000022398 24500 $$aSEISMIC RELIABILITY ASSESSMENT OF ROCKING BEHAVIOUR UNDER NEAR-FAULT EXCITATIONS

000022398 24630 $$n5.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000022398 260__ $$bNational Technical University of Athens, 2015
000022398 506__ $$arestricted
000022398 520__ $$2eng$$aThis paper assesses the seismic reliability of single degree of freedom rocking structures subjected to near-fault excitations within a probabilistic framework. In this context, it proposes a physically consistent and practically useful methodology to scale the rocking behavior for excitations of different intensity and predominant frequency. According to the assumptions of the proposed methodology the definition of both the Engineering Demand Parameter (EDP) and the corresponding limit states is rather straightforward, since when the rocking structure does not overturn it eventually returns to its original configuration without permanent deformation or damage. On the contrary, identifying appropriate intensity measure/s (IM/s) for rocking structures is far from trivial, longstanding challenge. Two groups of dimensionless-orientationless IMs are considered as candidate IMs: one giving the frequency ratio ωg/p and one equivalent with the dimensionless slenderness αg/(gtanα). Using four wellknown strong ground motion parameters (the peak ground velocity, the peak ground acceleration, the predominant period of the pulse and the mean period of the CSGM) six different versions of IMs are examined. In addition, this study, introduces a more ‘holistic’ approach for the description of the rocking fragility using hybrid bivariate IMs. Analytical fragility curves (FCs) for slender, rigid rocking structures are obtained, using either univariate IM/s (conventional FCs) or bivariate IM/s (bivariate FCs). The study shows that while the use of a univariate IM is a simpler approach, it results in increased scatter. On the other hand, the more complex bivariate IM approach utilizes additional information and reduces uncertainty. Further, the study also unveils that when the rocking structure survives the excitation without overturning, the peak response follows a bi-planar distribution. Specifically, it brings forward the existence of critical peak ground motion acceleration, below and above which rocking response scales differently.

000022398 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000022398 653__ $$aRocking, overturning risk, fragility curves, rocking bridges, earthquake engineering.

000022398 7112_ $$aCOMPDYN 2015 - 5th International Thematic Conference$$cCrete (GR)$$d2015-05-25 / 2015-05-27$$gCOMPDYN2015
000022398 720__ $$aDimitrakopoulos, Elias$$iParaskeva, Themelina
000022398 8560_ $$ffischerc@itam.cas.cz
000022398 8564_ $$s4394694$$uhttps://invenio.itam.cas.cz/record/22398/files/C709.pdf$$yOriginal version of the author's contribution as presented on CD, section: 
.
000022398 962__ $$r22030
000022398 980__ $$aPAPER