000021597 001__ 21597
000021597 005__ 20170622131254.0
000021597 04107 $$aeng
000021597 046__ $$k2017-06-15
000021597 100__ $$aScotta, Roberto
000021597 24500 $$aWATER TOWERS UNDERGOING DYNAMIC ACTIONS: NUMERICAL SOLUTION OF COUPLED FSI PROBLEM AND APPLICATIONS

000021597 24630 $$n6.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000021597 260__ $$bNational Technical University of Athens, 2017
000021597 506__ $$arestricted
000021597 520__ $$2eng$$aIn the common practice seismic analysis of water tanks is based on the analytical solutions of free surface fluid undergoing sinusoidal actions. The identification of impulsive and convective contributions (frequencies, modal shapes, pressure distribution, etc.) allows the definition of equivalent mechanical models able to represent cisterns on flexible structures. This procedure, however, only applies to a few common shapes of tank and it is based on simplifying assumptions, such as ideal fluid and uncovered tank. In the present study a sound procedure is proposed with the aim of analyzing water towers undergoing dynamic actions inducing sloshing phenomena and their interaction with structural overcoming simplying assumptions. A weakly coupling a fluid and a structural solver is introduced: at each time step structure’s motion becomes the boundary conditions to be applied to the fluid and pressures obtained from this last give back forces to be applied to the structure together with other external actions. Fluid problem is solved thanks to an edgebased level set finite element method for free surface flows developed within the multi-physic code Kratos (CIMNE, Barcelona) while structure, composed by monodimensional linear finite elements, is solved by Newmark method on mass, damping and stiffness matrices. At this stage of development, rigid walls are assumed for the tank. Proposed approach was used to study the dynamic behavior of a 450 m3 capable cylindrical tank undergoing seismic action, both in the case of base on ground and at top of a concrete water tower. Sinusoidal base displacements and accelerograms were applied to the structure: results were compared with those from analytical solution and equivalent mechanical model. Results from different approaches show full agreement among them demonstrating the reliability of the proposed FSI strategy. Future studies will concern different and more complex shapes of tanks and also covered ones which may experiment uplift of the roof due to the slosh wave. Moreover, strong coupling will be implemented within Kratos code to consider also deformable tanks.

000021597 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000021597 653__ $$a

000021597 7112_ $$aCOMPDYN 2017 - 6th International Thematic Conference$$cRhodes Island (GR)$$d2017-06-15 / 2017-06-17$$gCOMPDYN2017
000021597 720__ $$aScotta, Roberto$$iRossi, Riccardo$$iLarese, Antonia$$iStecca, Enrico
000021597 8560_ $$ffischerc@itam.cas.cz
000021597 8564_ $$s117688$$uhttps://invenio.itam.cas.cz/record/21597/files/17181.pdf$$yOriginal version of the author's contribution as presented on CD, section: [RS05] Dynamics of coupled problems
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000021597 962__ $$r21500
000021597 980__ $$aPAPER