Seismic analysis of liquid storage composite conical tanks

2018 ◽  
Vol 159 ◽  
pp. 128-140
Author(s):  
Ahmed A. Elansary ◽  
Ashraf A. El Damatty
Keyword(s):  
Seismic Analysis ◽  
Liquid Storage ◽  
Conical Tanks

Discrete Models for Seismic Analysis of Liquid Storage Tanks of Arbitrary Shape and Fill Height

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
G. C. Drosos ◽  
A. A. Dimas ◽  
D. L. Karabalis
Keyword(s):  
Arbitrary Shape ◽  
Seismic Analysis ◽  
Fluid Motion ◽  
Discrete Models ◽  
Storage Tanks ◽  
Fem Modeling ◽  
Liquid Mass ◽  
Liquid Storage ◽  
Conical Tanks ◽  
Cylindrical Tanks

A finite element method (FEM)-based formulation is developed for an effective computation of the eigenmode frequencies, the decomposition of total liquid mass into impulsive and convective parts, and the distribution of wall pressures due to sloshing in liquid storage tanks of arbitrary shape and fill height. The fluid motion is considered to be inviscid (slip wall condition) and linear (small free-surface steepness). The natural modal frequencies and shapes of the sloshing modes are computed, as a function of the tank fill height, on the basis of a conventional FEM modeling. These results form the basis for a convective-impulsive decomposition of the total liquid mass, at any fill height, for the first few (two or three at most) sloshing modes, which are by far the most important ones in comparison to all other higher modes. This results into a simple yet accurate and robust model of discrete masses and springs for the sloshing behavior. The methodology is validated through comparison studies involving vertical cylindrical tanks. Additionally, the application of the proposed methodology to conical tanks and to the seismic analysis of spherical tanks on a rigid or flexible supporting system is demonstrated and the results are compared to those obtained by rigorous FEM analyses.

scholarly journals Analysis of the peak vertical displacement of liquid surface due to sloshing

2020 ◽  
Vol 313 ◽  
pp. 00023
Author(s):  
Kamila Kotrasova ◽  
Eva Kormanikova ◽  
Iveta Hegedusova
Keyword(s):  
Liquid Surface ◽  
Seismic Analysis ◽  
Vertical Displacement ◽  
Theoretical Background ◽  
Seismic Effect ◽  
Liquid Storage ◽  
Fluid Sloshing ◽  
Hydrodynamic Effects ◽  
Extensive Damage

When a tank containing liquid vibrates, the liquid exerts hydrodynamic effects on the solid domain of a tank. In the case of roof tanks, a large sloshing wave will impact the wall or roof of the tanks and may cause extensive damage or failure of the tanks. This paper provides the theoretical background of simplified seismic analysis of liquid storage cylindrical ground -supported tanks, and it documents the seismic effect of input motions characteristics on fluid sloshing behaviour.

Seismic analysis of base-isolated liquid storage tanks using the BE–FE–BE coupling technique

2002 ◽  
Vol 22 (9-12) ◽  
pp. 1151-1158 ◽  
Author(s):  
Moon Kyum Kim ◽  
Yun Mook Lim ◽  
Seong Yong Cho ◽  
Kyung Hwan Cho ◽  
Kang Won Lee
Keyword(s):  
Seismic Analysis ◽  
Storage Tanks ◽  
Coupling Technique ◽  
Liquid Storage

Simplified procedure for design of liquid-storage combined conical tanks

2009 ◽  
Vol 47 (6-7) ◽  
pp. 750-759 ◽  
Author(s):  
Amr M.I. Sweedan ◽  
Ashraf A. El Damatty
Keyword(s):  
Liquid Storage ◽  
Conical Tanks ◽  
Simplified Procedure

Parametric study of stochastic seismic responses of base-isolated liquid storage tanks under near-fault and far-fault ground motions

2016 ◽  
Vol 24 (24) ◽  
pp. 5747-5764 ◽  
Author(s):  
Sina Safari ◽  
Reza Tarinejad
Keyword(s):  
Base Isolation ◽  
Seismic Analysis ◽  
Ground Motions ◽  
Characteristic Parameter ◽  
Statistical Linearization ◽  
Storage Tanks ◽  
Earthquake Excitation ◽  
Isolation System ◽  
Near Fault ◽  
Liquid Storage

Seismic response of base isolated steel liquid storage tanks is investigated in this study by a stochastic approach in frequency domain. For the purpose of evaluating different frequency contents of seismic events on the responses of fixed and isolated tanks, the earthquake excitation is characterized by power spectral density function. Since earthquake is a random process, stochastic seismic analysis is used and root mean square response predicts behavior of system properly. Two types of isolation system are assumed and nonlinear behavior of base isolation systems are developed by an iterative statistical linearization scheme. The study demonstrates the influence of each characteristic parameter of the storage tanks and isolation system and also excitation features. It is confirmed that near-fault earthquake excitations amplify the overall response of the system. Base isolation is known as an effective technique to reduce responses appropriately. It is demonstrated that the sloshing responses of the tanks is significantly reduced by sliding bearing. Further, excitation parameters, PGV/PGA ratio of records and pulse period in near-fault ground motions, that represent differences in two sets of earthquakes are defined to recognize variation of responses.

Seismic Analysis of Base-Isolated Liquid Storage Tank with Submerged Block

2022 ◽  
Vol 27 (1) ◽  
pp. 04021052
Author(s):  
Meher Deepak Narayanasetti ◽  
Amiya Pandit ◽  
Kishore Chandra Biswal
Keyword(s):  
Storage Tank ◽  
Seismic Analysis ◽  
Liquid Storage ◽  
Liquid Storage Tank

Seismic analysis of elevated pure conical tanks under vertical excitation

2014 ◽  
Vol 41 (10) ◽  
pp. 909-917 ◽  
Author(s):  
Michael Jolie ◽  
Ayman M. El Ansary ◽  
Ashraf A. El Damatty
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Seismic Analysis ◽  
Three Dimensional ◽  
Vertical Component ◽  
Element Model ◽  
Shell Elements ◽  
Vertical Excitation ◽  
Analysis And Design ◽  
Conical Tanks

Truncated conical vessels are commonly used as liquid containers in elevated tanks. Despite the widespread use of this type of structure worldwide, no direct code provisions are currently available covering its seismic analysis and design. The purpose of the current study is to assess the importance of considering the vertical component of ground accelerations when analyzing and designing this type of water-storage structure. The study is conducted using an equivalent mechanical model that estimates the normal forces that develop in the tank walls when subjected to vertical excitation. In addition, a three-dimensional finite element model has been developed by modeling the walls of the tank using shell elements. The finite element model has been employed to predict maximum membrane and overall meridional stresses due to both hydrodynamic and hydrostatic pressure distributions. Comparisons have been conducted to assess the significance of considering vertical excitation and to identify the magnification in meridional stresses due to bending effects associated with support conditions and large deformations.

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