000018949 001__ 18949
000018949 005__ 20170118182249.0
000018949 04107 $$aeng
000018949 046__ $$k2017-01-09
000018949 100__ $$aMaree, Ahmed
000018949 24500 $$aExperimental Dynamic Response of Free-Standing Bodies Under Near Field and Far Field Ground Motions

000018949 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018949 260__ $$b
000018949 506__ $$arestricted
000018949 520__ $$2eng$$aThis study is a part of a research project evaluating seismic response of free-standing dry storage casks under long-term seismic events. Free-standing structures are highly susceptible to rocking and sliding during seismic events. Characterization of motion of three dimensional free-standing structures is a highly nonlinear problem, especially when rocking and sliding motion occur simultaneously. Response of such free-standing bodies depend on many factors like aspect ratios (radius to centroidal height ratio, r/hcg), coefficient of friction and ground motion characteristics. The main purpose of this article is to present the effect of ground motions with a single large pulse and those with multiple smaller pulses (NFGMs and FFGMs, respectively) on the dynamic response of free-standing bodies. For this purpose, experiments with Near Field and Far Field ground motions were conducted using a six degree-of-freedom (6DOF) shake table at the University of Nevada, Reno. Four scaled free-standing bodies with four different aspect ratio: 0.39, 0.43, 0.55 and 0.62; were studied in the experimental tests. However, results for free-standing bodies of three aspect ratios (0.39, 0.43, and 0.62) are discussed in this article. Ground motion records used in the study were spectrally matched to the seismic hazard level or spectral accelerations developed for earthquake events of 10,000 and 30,000 year return periods. The same system and ground motion cases were used several times to investigate whether the response of free-standing bodies is repeatable under scenarios. The experimental results show that the ground motions containing multiple pulses (FFGMs) produces more lateral displacements and rocking angle compared to NFGMs. The results also show that the casks’ response lacks repeatability under random ground motions. Finally, three chaotic analysis methods are used to investigate the reason behind such lack of repeatability.

000018949 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018949 653__ $$aFree-standing Structures; Rocking; Sliding; Near Field and Far Field Motion; Chaotic analysis

000018949 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018949 720__ $$aMaree, Ahmed$$iNielsen, Taylor$$iIbarra, Luis$$iSanders, David$$iPantelides, Chris$$iDangol, Sharad
000018949 8560_ $$ffischerc@itam.cas.cz
000018949 8564_ $$s1999931$$uhttps://invenio.itam.cas.cz/record/18949/files/2548.pdf$$yOriginal version of the author's contribution as presented on USB, paper 2548.
000018949 962__ $$r16048
000018949 980__ $$aPAPER