Investigation of seismic performance offloating roof steel storage tanks withconsideration of new type of energy dissipation system
Başlık çevirisi mevcut değil.
- Tez No: 708511
- Danışmanlar: DR. ROBERTO NASCİMBENE, DR. EMANUELE BRUNESİ
- Tez Türü: Yüksek Lisans
- Konular: Deprem Mühendisliği, Earthquake Engineering
- Anahtar Kelimeler: steel storage tanks, floating roof, energy dissipation, fluid-structure interaction (FSI), Arbitrary Lagrangian-Eulerian algorithm (ALE), hydrodynamic pressure, finite element
- Yıl: 2018
- Dil: İngilizce
- Üniversite: Università degli Studi di Pavia (University of Pavia)
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 113
Özet
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Özet (Çeviri)
This thesis investigates the seismic response of floating roofed steel liquid storage tanks with and without consideration of energy dissipation system proposed herein. The system is newly introduced, hence, there is no direct application of it in practice. It consists of floating roof with the addition of external dampers, which makes it easy to implement on existing tanks and a good candidate for improving the performance. The roof facilitates the incorporation of supplemental devices with which the level of damping of the liquid vibration can be substantially augmented. The main objective of the work presented here is to observe the influence of dissipation system on the performance of the steel storage tanks through numerical models. The research focuses on the case of above ground cylindrical storage tanks fully anchored at their base, filled partially with water. The comparison is provided between the two cases, with (w/) and without (w/o) consideration of dissipation system, using highdefinition finite element models. Numerical methods are very useful tools for assessing the seismic behaviour of such structures as storage tanks which show highly nonlinear dynamic behaviour. In this study, arbitrary lagrangian eulerian (ALE) formulation is used to represent nonlinear fluid structure interaction (FSI). Navier-stokes equations are assumed to govern the motion of the fluid, and only geometric nonlinearities are considered in the wall of the tank to determine stress, strain and pressure distributions. The discrete elements have been used to represent external supplemental devices. The FE code LS-DYNA was used to perform any analysis. The numerical model proposed herein have been validated using two past experimental tests which includes different geometrical shapes (rectangular and cylindrical). For both cases, floating roof tanks with and without supplemental devices, a good fit between experimental and numerical estimates have been obtained. A series of seismic analysis have been performed to evaluate the performance of dissipation system. The change in seismic response because of geometrical variations and seismic input (far field and near field) have been quantified. In particular, the effectiveness of the system with respect to the height-to-radius ratio have been discussed.
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