Dynamic Buckling Analysis of Cylindrical Water Storage Tanks: A New Simulation Method Considering Coupled Vibration Between Fluid and Structure

2009 ◽  
Author(s):  
Akira Maekawa ◽  
Katsuhisa Fujita
Keyword(s):  
Shell Structure ◽  
Water Storage ◽  
Safety Margin ◽  
Time History ◽  
Buckling Analysis ◽  
Dynamic Buckling ◽  
Coupled Analysis ◽  
Storage Tanks ◽  
Analysis Method ◽  
Coupled Vibrations

This paper proposes a dynamic buckling analysis method which can accurately simulate the buckling behavior of cylindrical water storage tanks during an earthquake. The proposed method takes into account the behavior of oval-type vibration as well as beam-type vibration, which are coupled vibrations between the shell structure of the tank and the water stored in the tank. In the proposed method, both the tank and the stored water are three-dimensionally modeled by finite elements and time history analysis is conducted. Moreover, coupled analysis between the fluid and structure and large deformation analysis to the shell structure of the tank are also considered. The analytical results by the proposed method agreed well with those of experiments regarding occurrence of oval-type vibration, mode of buckling and buckling load. The method can accurately simulate the seismic response including the coupled vibrations and the process of damage such as buckling of the cylindrical water storage tank during an earthquake. In conclusion, the proposed dynamic buckling analysis method can quantitatively evaluate the seismic performance of water storage tanks such as seismic safety margin.

Dynamic Buckling Simulation of Cylindrical Liquid Storage Tanks Subjected to Seismic Motions

2010 ◽  
Author(s):  
Akira Maekawa ◽  
Katsuhisa Fujita
Keyword(s):  
Numerical Simulation ◽  
Seismic Response ◽  
Large Deformation ◽  
Three Dimensional ◽  
Mesh Size ◽  
Buckling Analysis ◽  
Dynamic Buckling ◽  
Storage Tanks ◽  
Analysis Method ◽  
Liquid Storage

A three-dimensional and elastic-plastic dynamic buckling analysis method that takes into consideration fluid-structure coupling and large deformation is proposed in order to accurately simulate the seismic response of cylindrical liquid storage tanks. The results of a dynamic buckling experiment of a tank using seismic motions closely match those of numerical simulation by the proposed method. The mesh size of the analytical model greatly influences the buckling analysis results. Optimization of the size is also discussed.

scholarly journals Investigation of applying dampers in elevated water tanks using time-history analysis

2015 ◽  
Vol 4 (1) ◽  
pp. 169
Author(s):  
Ehsan Rajaie
Keyword(s):  
Dynamic Behavior ◽  
Water Storage ◽  
Time History ◽  
Time History Analysis ◽  
Storage Tanks ◽  
Base Shear ◽  
Shear Forces ◽  
History Analysis ◽  
Elevated Water ◽  
Water Tanks

In this paper, the dynamic behavior of water storage tanks in investigated. Using time-history analysis based on three major earthquakes, the performance of system is illustrated. Two conditions, first with damper and second with no damper are presented and the relevant results are compared. The main results consist of base shear forces and also maximum target displacements. 

scholarly journals Seismic response of reinforced concrete elevated water towers.

2021 ◽  
Author(s):  
Aren Nazari
Keyword(s):  
Finite Element ◽  
Ground Motions ◽  
Water Storage ◽  
Time History ◽  
Current Approach ◽  
Finite Element Analyses ◽  
Storage Tanks ◽  
Element Analysis ◽  
Non Linear ◽  
Elevated Water

Modern composite elevated storage tanks were developed in late 1970's in response to increasing demand for a reliable, economical and low-maintenance water storage system in Canada and the U.S. The popularity of composite elevated water towers rose tremendously in the last 30 years, as the new type of construction offered many advantages over traditional elevated water storage tanks. Despite the increasing rate of construction, the performance of this type of structure under ground motions is not fully understood. During the recent earthquake of Bhuj 2001, many shaft staging elevated water towers experienced severe damages, signifying the lack of considerable ductility, redundancy and energy dissipation in the system. This thesis investigates the current approach to the design of shaft staging elevated towers, and also summarizes a comprehensive literature review of structural theories, latest research and studies. The response of a selected concrete shaft staging elevated tower, designed according to the currant [sic] practice and subjected to gradually increasing lateral load was investigated through a non-linear static finite element analysis. Additionally, the seismic performance of the structure during four different ground motions with various peak ground accelerations was studied through several time-history non-linear finite element analyses. The results of static and dynamic finite element analyses were used to evaluate and establish the response modification factor used for design of these types of structures.

A Study of Fluid-Structure Coupled Analysis for Large LNG Storage Tanks in Consideration of Uplift

2011 ◽  
Author(s):  
Shoichiro Hayashi ◽  
Tomoyo Taniguchi ◽  
Akira Umeda ◽  
Hisayuki Yamada ◽  
Takumi Kawasaki ◽  
...  
Keyword(s):  
Plate Thickness ◽  
Time History ◽  
Fem Analysis ◽  
Coupled Analysis ◽  
Soil Conditions ◽  
Seismic Load ◽  
Storage Tanks ◽  
Base Shear ◽  
Fluid Structure ◽  
Tank Design

With the rising demand for LNG in recent years, expansion of existing LNG terminals and construction of new ones are planned in many places around the world, and some of such projects are already in progress. Sites selected for these projects may not necessarily have favorable soil conditions from the viewpoint of seismic protection. Seismic demand tends to be higher for LNG storage tanks to be built on such sites. Severe seismic deign conditions require precise estimation of the uplift at the annular part during the earthquake. Depending on the estimation results, either of the following measures needs to be taken: increase of the plate thickness; installation of anchors or seismic isolators; and, occasionally, modification of the tank proportion. Uplift estimation is usually based on conventional design methods in which seismic load is converted into static load, because dynamic behavior of uplift is hardly taken into account in the design process due to its complexity. Some previous fundamental studies revealed that tank uplift and other dynamically induced responses would tend to be smaller than those simulated by static loads. This indicates a possibility of optimizing tank structure based on these research results. As a step toward introducing the uplift response in tank design properly, a time-history FEM analysis with fluid-structure coupling was carried out to understand the tank uplift behavior. This paper reports the findings from the analysis, including comparison with conventional analysis and previous fundamental studies. Since the rocking response may reduce overturning moment and base shear of tanks, structural design may have benefits if such mechanisms are properly taken into account.

scholarly journals Seismic response of reinforced concrete elevated water towers.

2021 ◽  
Author(s):  
Aren Nazari
Keyword(s):  
Finite Element ◽  
Ground Motions ◽  
Water Storage ◽  
Time History ◽  
Current Approach ◽  
Finite Element Analyses ◽  
Storage Tanks ◽  
Element Analysis ◽  
Non Linear ◽  
Elevated Water

Modern composite elevated storage tanks were developed in late 1970's in response to increasing demand for a reliable, economical and low-maintenance water storage system in Canada and the U.S. The popularity of composite elevated water towers rose tremendously in the last 30 years, as the new type of construction offered many advantages over traditional elevated water storage tanks. Despite the increasing rate of construction, the performance of this type of structure under ground motions is not fully understood. During the recent earthquake of Bhuj 2001, many shaft staging elevated water towers experienced severe damages, signifying the lack of considerable ductility, redundancy and energy dissipation in the system. This thesis investigates the current approach to the design of shaft staging elevated towers, and also summarizes a comprehensive literature review of structural theories, latest research and studies. The response of a selected concrete shaft staging elevated tower, designed according to the currant [sic] practice and subjected to gradually increasing lateral load was investigated through a non-linear static finite element analysis. Additionally, the seismic performance of the structure during four different ground motions with various peak ground accelerations was studied through several time-history non-linear finite element analyses. The results of static and dynamic finite element analyses were used to evaluate and establish the response modification factor used for design of these types of structures.

Dynamic Buckling Test of Modified 1/10 Scale Model of Cylindrical Water Storage Tank

2007 ◽  
Author(s):  
Akira Maekawa ◽  
Katsuhisa Fujita ◽  
Toru Sasaki
Keyword(s):  
Fluid Pressure ◽  
Water Storage ◽  
Initial Imperfection ◽  
Buckling Analysis ◽  
Dynamic Buckling ◽  
Scale Model ◽  
The Finite Element Method ◽  
Tank Model ◽  
Water Storage Tank ◽  
Reduced Scale

This study reports on the dynamic buckling experiment of a 1/10 reduced scale model of a large-scale cylindrical water storage tank by using a shaking table, and the buckling analysis by using both the simplified method and the finite element method. The dynamic buckling experiment is performed by using the reduced scale tank model whose initial imperfection has been measured. The tank model is filled with water up to 95% of the full level, and puts 200-weight on its top, overcoming the response reduction induced by the oval-type vibration. The sinusoidal waves are used as the input. As a result of the experiment, the bucking occurs on the tank and plastic deformation is observed on the side and bottom of the tank. Two methods of the buckling analysis are carried out. At first, the buckling load is estimated by using a simplified method adopted in the current Japanese guideline. The analytical result shows this method is conservative despite using the tank with initial imperfection. Secondly, the static buckling analysis with the finite element method is conducted. There is an issue how to treat the dynamic fluid pressure distribution of the contained water in the tank with regard to the static analysis, because the coupling between fluid and structure cannot be taken into consideration. In this study, the distribution of the dynamic fluid pressure is calculated in accordance with the Fischer’s method. The buckling load calculated by using the dynamic fluid pressure distribution agrees with that of the experiment approximately. Therefore, it is appropriate to apply this proposed static analytical method to seismic design.

scholarly journals The effect of household storage tanks/vessels and user practices on the quality of water: a systematic review of literature

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Musa Manga ◽  
Timothy G. Ngobi ◽  
Lawrence Okeny ◽  
Pamela Acheng ◽  
Hidaya Namakula ◽  
...  
Keyword(s):  
Systematic Review ◽  
Water Quality ◽  
Storage Tank ◽  
Grey Literature ◽  
Water Storage ◽  
Storage Tanks ◽  
Water Storage Tank ◽  
Hygiene Practices ◽  
Quality Of Water ◽  
Vessel Material

Abstract Background Household water storage remains a necessity in many communities worldwide, especially in the developing countries. Water storage often using tanks/vessels is envisaged to be a source of water contamination, along with related user practices. Several studies have investigated this phenomenon, albeit in isolation. This study aimed at developing a systematic review, focusing on the impacts of water storage tank/vessel features and user practices on water quality. Methods Database searches for relevant peer-reviewed papers and grey literature were done. A systematic criterion was set for the selection of publications and after scrutinizing 1106 records, 24 were selected. These were further subjected to a quality appraisal, and data was extracted from them to complete the review. Results and discussion Microbiological and physicochemical parameters were the basis for measuring water quality in storage tanks or vessels. Water storage tank/vessel material and retention time had the highest effect on stored water quality along with age, colour, design, and location. Water storage tank/vessel cleaning and hygiene practices like tank/vessel covering were the user practices most investigated by researchers in the literature reviewed and they were seen to have an impact on stored water quality. Conclusions There is evidence in the literature that storage tanks/vessels, and user practices affect water quality. Little is known about the optimal tank/vessel cleaning frequency to ensure safe drinking water quality. More research is required to conclusively determine the best matrix of tank/vessel features and user practices to ensure good water quality.

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