000021852 001__ 21852
000021852 005__ 20170622131308.0
000021852 04107 $$aeng
000021852 046__ $$k2017-06-15
000021852 100__ $$aVathi, Maria
000021852 24500 $$aNUMERICAL AND EXPERIMENTAL INVESTIGATION OF BASE PLATE INTEGRITY IN UNANCHORED LIQUID STORAGE TANKS

000021852 24630 $$n6.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000021852 260__ $$bNational Technical University of Athens, 2017
000021852 506__ $$arestricted
000021852 520__ $$2eng$$aGround-supported unanchored liquid-storage cylindrical tanks, when subjected to strong seismic loading may exhibit uplifting of their bottom plate, which has significant effects on their dynamic behavior and strength. Those effects mainly concern: (a) the increase of axial (meridional) compression at the tank base, resulting in premature buckling in the form of elephant’s foot and (b) the significant plastic deformation at the vicinity of the welded connection between the tank shell and the bottom plate that may cause failure of the welded connection due to fracture and fatigue. The present study focuses on base uplifting mechanics and tank performance with respect to the shell/plate welded connection through numerical and experimental tools. First, a numerical two-step methodology is presented: (1) a simplified modeling of the tank as a springmass system for dynamic analysis, enhanced by a nonlinear spring at its base to account for the effects of uplifting, (2) a detailed finite element shell model of the tank for incremental static analysis, capable of describing the state of stress and deformation at different levels of loading, in order to obtain the overturning moment-rocking angle relationship to use in the simplified model. Two cylindrical liquid storage tanks of different aspect ratios are modeled and analyzed in terms of local performance of the welded connection. The results are aimed at better understanding of tank uplifting mechanics and motivating possible amendments in existing seismic design provisions. In addition to the above numerical investigation, experiments are performed, so that the strength of the end-plate/tank-shell connection is examined under severe cyclic loading that may cause low-cycle fatigue. The experiments are employed to define an appropriate fatigue curve of the welded connection, for use in the numerical investigation.

000021852 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000021852 653__ $$a

000021852 7112_ $$aCOMPDYN 2017 - 6th International Thematic Conference$$cRhodes Island (GR)$$d2017-06-15 / 2017-06-17$$gCOMPDYN2017
000021852 720__ $$aVathi, Maria$$iKaramanos, Spyros A.$$iPerdikaris, Philip C.$$iPapatheocharis, Charis$$iPappa, Patricia
000021852 8560_ $$ffischerc@itam.cas.cz
000021852 8564_ $$s117260$$uhttps://invenio.itam.cas.cz/record/21852/files/18153.pdf$$yOriginal version of the author's contribution as presented on CD, section: [MS33] WORKSHOP on Fragility Evaluation and Seismic Safety Assessment of “Special Risk” Industrial Plants (INDUSE-2-SAFETY)
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000021852 962__ $$r21500
000021852 980__ $$aPAPER