Floating Roof Influence on Seismic Response of Large Vertical Storage Tank

2013 ◽  
Vol 671-674 ◽  
pp. 1399-1402
Author(s):  
Ying Sun ◽  
Jian Gang Sun ◽  
Li Fu Cui
Keyword(s):  
Seismic Response ◽  
Storage Tank ◽  
Numerical Solutions ◽  
Fluid Pressure ◽  
Seismic Intensity ◽  
Site Conditions ◽  
Storage Tanks ◽  
Analysis Model ◽  
Base Shear ◽  
The Impact

To study the impact of floating roof on seismic response of vertical storage tank structure system subjected to seismic excitation, select 150000m3 storage tanks as research object, and the finite element analysis model of storage tanks with and without floating roof were established respectively. The seismic response of these two types of structure in different site conditions and seismic intensity were calculated and the numerical solutions were compared. The results show that floating roof has little impact on base shear and base moment in different site conditions and seismic intensity. Floating roof can effectively reduce the sloshing wave height. The influence of floating roof on dynamic fluid pressure decreases with the increase of seismic intensity, which is less affected by ground conditions.

Dynamic Buckling of 50000m3 Vertical Storage Tanks under Seismic Excitation

2013 ◽  
Vol 353-356 ◽  
pp. 2039-2042
Author(s):  
Sun Ying ◽  
Jian Gang Sun ◽  
Li Fu Cui
Keyword(s):  
Storage Tank ◽  
Numerical Solutions ◽  
Base Isolation ◽  
Three Dimensional ◽  
Dynamic Buckling ◽  
Seismic Excitation ◽  
Storage Tanks ◽  
Isolation System ◽  
Base Isolation System ◽  
The Impact

To study the dynamic buckling characteristics of storage tank subjected to three-dimensional seismic excitation, selecting 50000m3 large vertical floating roof storage tanks as research object, the base isolation system was introduced and allowing for the impact of floating roof. The finite element models of non-isolation and base isolation storage tank were established respectively by ADINA. The seismic responses of these two types of storage tank were calculated and the numerical solutions were compared. The results indicate that the dynamic buckling modes of these two types of storage tank system belong to plastic buckling; base isolation measure can effectively increase the critical load value of dynamic buckling and plasticity yielding, the improve rates up to 38% and 60% respectively. The effectiveness of the base isolation can be verified from the angle of buckling.

Basic Theory of Simplified Dynamic Model for Spherical Tank Considering Swinging Effect

2019 ◽  
Vol 141 (6) ◽  
Author(s):  
Yuan Lü ◽  
Jiangang Sun ◽  
Zongguang Sun ◽  
Lifu Cui ◽  
Zhen Wang
Keyword(s):  
Dynamic Model ◽  
Shear Force ◽  
Velocity Potential ◽  
Fluid Pressure ◽  
Site Conditions ◽  
Base Shear ◽  
Site Condition ◽  
Spherical Tank ◽  
Overturning Moment ◽  
The Difference

Abstract Consider the swinging effect of spherical tank, the theory of velocity potential is adopted, and a reasonable potential function is derived according to the boundary conditions. Further, the dynamic fluid pressure, the wave height of the liquid, the shear force and the overturning moment at the bottom of the spherical tank is calculated, and a simplified dynamic model of spherical tank considering liquid sloshing and swinging effect was constructed. The seismic response was studied and compared with the results without considering the swing effect. The results show that: for Ι, II site conditions, base shear force and overturning moment of considering the swing effect is slightly smaller than when nonconsidering and the difference rate between the two is very small. III–IV site conditions, each condition value of considering the swing effect is larger than when nonconsidering and the difference rate between the two is relatively large. Aseismic design of spherical tank and the influence of swing effect should be considered if the site condition is III and IV, and if site I and II, they can be ignored.

scholarly journals Seismic Analysis of a Large LNG Tank Considering Different Site Conditions

2020 ◽  
Vol 10 (22) ◽  
pp. 8121 ◽  
Author(s):  
Yi Zhao ◽  
Hong-Nan Li ◽  
Shuocheng Zhang ◽  
Oya Mercan ◽  
Caiyan Zhang
Keyword(s):  
Seismic Response ◽  
Structural Design ◽  
Well Being ◽  
Von Mises Stress ◽  
Site Conditions ◽  
Storage Tanks ◽  
Site Class ◽  
Lng Tank ◽  
Von Mises ◽  
Site Classes

Seismic resilience of critical infrastructure, such as liquefied natural gas (LNG) storage tanks, is essential to the safety and economic well-being of the general public. This paper studies the effect of different ground motions on large LNG storage tanks under four different site conditions. Key parameters of structural design and dynamic analysis, including von Mises stress of outer and inner tanks, tip displacement, and base shear, are analyzed to directly evaluate the safety performance of the large LNG tanks. Because the size of an LNG tank is too large to perform any experiments on a physical prototype, Smoothed Particle Hydrodynamics-Finite Element Method (SPH-FEM) simulation is used as a feasible and efficient method to predict its seismic response. First, the accuracy of the SPH-FEM method is verified by comparing sloshing frequencies obtained from theoretical formulation to experimental results and SPH-FEM models. Then, the seismic response of a real-life 160,000 m3 LNG prestressed storage tank is evaluated with different liquid depths under four site classes. Simulation results show that the tip displacements of the LNG tank at liquid levels of 25% and 50% under site class IV are nearly identical to that of 75% and 100% under site class II. In addition, the maximum von Mises stress of the inner tanks exceeds 500 MPa in all four site classes and jeopardizes the structural integrity of large LNG tanks. As a result, optimization of structural design and the establishment of an early warning system are imperative to the safety of LNG tanks at high liquid levels.

Comparison between standards for seismic design of liquid storage tanks with respect to soil-foundation-structure interaction and uplift

2012 ◽  
Vol 45 (1) ◽  
pp. 40-46 ◽  
Author(s):  
Miguel Ormeño ◽  
Tam Larkin ◽  
Nawawi Chouw
Keyword(s):  
Seismic Response ◽  
Seismic Design ◽  
Earthquake Engineering ◽  
Storage Tanks ◽  
Base Shear ◽  
Structure Interaction ◽  
Liquid Storage ◽  
Field Evidence ◽  
Soil Foundation ◽  
Foundation Structure

Field evidence has established that strong earthquakes can cause severe damage or even collapse of liquid storage tanks. Many tanks worldwide are built near the coast on soft soils of marginal quality. Because of the difference in stiffness between the tank (rigid), foundation (rigid) and the soil (flexible), soil-foundation-structure interaction (SFSI) has an important effect on the seismic response, often causing an elongation of the period of the impulsive mode. This elongation is likely to produce a significant change in the seismic response of the tank and will affect the loading on the structure. An issue not well understood, in the case of unanchored tanks, is uplift of the tank base that usually occurs under anything more than moderate dynamic loading. This paper presents a comparison of the loads obtained using “Appendix E of API STANDARD 650” of the American Petroleum Institute and the “Seismic Design of Storage Tanks” produced by the New Zealand Society for Earthquake Engineering. The seismic response assessed using both codes is presented for a range of tanks incorporating a range of the most relevant parameters in design. The results obtained from the analyses showed that both standards provide similar base shear and overturning moment; however, the results given for the anchorage requirement and uplift are different.

INVESTIGATION OF VOLATILE ORGANIC COMPOUND (VOC) EMISSION IN OIL TERMINAL STORAGE TANK PARKS/LAKIŲJŲ ORGANINIŲ JUNGINIŲ (LOJ) EMISIJOS TYRIMAS NAFTOS TERMINALO TALPYKLŲ PARKUOSE/ ИССЛЕДОВАНИЕ ЭМИССИИ ЛЕГКОЛЕТУЧИХ ОРГАНИЧЕСКИХ СОЕДИНЕНИЙ (ЛОС) В ПАРКАХ РЕЗЕРВУАРОВ НЕФТЯНОГО ТЕРМИНАЛА

2009 ◽  
Vol 17 (2) ◽  
pp. 81-88 ◽  
Author(s):  
Tatjana Paulauskienė ◽  
Vytenis Zabukas ◽  
Petras Vaitiekūnas
Keyword(s):  
Organic Compound ◽  
Volatile Organic Compound ◽  
Calculation Method ◽  
Storage Tank ◽  
Complex Analysis ◽  
Oil Products ◽  
Storage Tanks ◽  
Volatile Organic ◽  
Meteorological Elements ◽  
The Impact

The problem of VOC volatilization into the atmosphere from oil terminals is discussed in the paper. Investigation of VOC concentration in an oil terminal was performed in characterized spots of the main pollutant concentration ‐ in storage tank parks of light and heavy oil products. A complex analysis of the impact of meteorological elements, oil‐product‐storage tank construction, the level of filling storage tanks with oil products on the emissions of VOCs in oil terminals and adjacent territories is provided in the paper. The dependence of VOC concentration on the following parameters of the construction of storage tanks was analysed: the capacity of storage tanks, the insulation between the wall of a storage tank and peculiarities of the pontoon construction (single, double, triple insulation). The results of the investigation may be applied for the development and improvement of the VOC calculation method (LAND 31–2007/M‐11), reduction of VOC emissions in the existing oil terminals and when developing new ones. Santrauka Analizuojami profesiniai pavojai, kuriems gresiant būtina nustatyti rizikos lygį. Tirtas darbo aplinkos mikroklimatas, apšvieta, triukšmas ir dulkėtumo lygis. Profesiniams pavojams gamyboje įvertinti siūlomas paprastas ir lankstus rizikos vertinimo metodas, pagrįstas skaitiniais kriterijais. Pateikiami penkių Estijos pramonės šakų (mašinų apdirbimo, spaudos, medienos, plastmasės ir tekstilės) tyrimo šiuo požiūriu rezultatai ir praktiniai pavyzdžiai. Kaip akivaizdžiausias pavojus sveikatai plačiai analizuojamas triukšmas, įvertinama klausos praradimo rizika. Straipsnio tikslas – atkreipti dėmesį, kaip svarbu pramonėje nustatyti profesinę riziką ir priminti apie kelis svarbius praktinius aspektus, kad darbo rizikos vertinimas būtų efektyvus ir padėtų darbuotojams, darbdaviams, darbo vietos higienos specialistams, gydytojams bei sprendimų priėmėjams.

Seismic Response Analysis of Large Liquid Storage Tanks

2012 ◽  
Vol 166-169 ◽  
pp. 2490-2493
Author(s):  
Yuan Zhang ◽  
You Hai Guan
Keyword(s):  
Seismic Response ◽  
Seismic Design ◽  
Storage Tank ◽  
Response Analysis ◽  
Storage Tanks ◽  
Performance Study ◽  
Seismic Response Analysis ◽  
Seismic Safety ◽  
Liquid Storage ◽  
Liquid Storage Tank

Due to frequent earthquakes in recent years, the seismic safety of large storage tank is very important. In this paper, seismic response of large liquid storage tanks is analyzed. A model for liquid storage tank is established firstly. By modality analysis, dynamic behavior of large storage tank is obtained. After the model is excitated by seismic, seismic responses are obtained. The conclusions show that, without considering liquid-solid coupling, "elephant foot" buckling phenomenon doesn’t appear. This study provides reference for seismic design and seismic performance study of large storage tank.

Evaluation of the apparent losses caused by water meter under-registration in intermittent water supply

2009 ◽  
Vol 60 (9) ◽  
pp. 2373-2382 ◽  
Author(s):  
A. Criminisi ◽  
C. M. Fontanazza ◽  
G. Freni ◽  
G. La Loggia
Keyword(s):  
Water Supply ◽  
Storage Tank ◽  
Storage Tanks ◽  
Water Utility ◽  
Intermittent Water Supply ◽  
Starting Flow ◽  
Water Tanks ◽  
The Impact ◽  
Water Meter

Apparent losses are usually caused by water theft, billing errors, or revenue meter under-registration. While the first two causes are directly related to water utility management and may be reduced by improving company procedures, water meter inaccuracies are considered to be the most significant and hardest to quantify. Water meter errors are amplified in networks subjected to water scarcity, where users adopt private storage tanks to cope with the intermittent water supply. The aim of this paper is to analyse the role of two variables influencing the apparent losses: water meter age and the private storage tank effect on meter performance. The study was carried out in Palermo (Italy). The impact of water meter ageing was evaluated in laboratory by testing 180 revenue meters, ranging from 0 to 45 years in age. The effects of the private water tanks were determined via field monitoring of real users and a mathematical model. This study demonstrates that the impact on apparent losses from the meter starting flow rapidly increases with meter age. Private water tanks, usually fed by a float valve, overstate meter under-registration, producing additional apparent losses between 15% and 40% for the users analysed in this study.

A Hybrid Control Method to Reduce the Seismic Response of a Liquid Storage Tank

2016 ◽  
Author(s):  
Hao Luo ◽  
Ruifu Zhang ◽  
Dagen Weng
Keyword(s):  
Seismic Response ◽  
Wave Height ◽  
Storage Tank ◽  
Control Method ◽  
Hybrid Control ◽  
Inertial Mass ◽  
Base Shear ◽  
Liquid Storage ◽  
Liquid Storage Tank ◽  
Base Displacement

In this study, a hybrid control method is proposed, in which both isolation bearings and an inertial mass damper (IMD) are used, to reduce the seismic response of a liquid storage tank. First, simplified models of the tank and IMD are illustrated. Next, to evaluate the effectiveness of the proposed method, three tanks, including a fixed tank, an isolated tank and an isolated tank with an IMD, are analyzed and compared. Last, parametric studies are conducted to investigate the effects of equivalent inertial mass and viscous damping of the IMD. It is observed that, compared with the fixed tank, the base shear of the isolated one is largely reduced, whereas the wave height is consequently amplified; for the isolated tank with an IMD, not only is the base shear more obviously reduced, but also the wave height is effectively controlled. What’s more, the base displacement of the isolated tank with an IMD is much lower than that of the isolated one. Therefore, the proposed method can be considered as an effective method to control the seismic response of the liquid storage tanks.

Seismic Response of Base-Isolated Liquid Storage Tanks

2003 ◽  
Vol 9 (10) ◽  
pp. 1201-1218 ◽  
Author(s):  
M. K. Shrimali ◽  
R. S. Jangid
Keyword(s):  
Seismic Response ◽  
Deformation Behavior ◽  
Seismic Isolation ◽  
Storage Tanks ◽  
Base Shear ◽  
Step Method ◽  
Isolation System ◽  
System Parameters ◽  
Liquid Mass ◽  
Liquid Storage

We investigate the seismic response of liquid storage tanks isolated by lead-rubber bearings. The force-deformation behavior of the bearings is considered as bi-linear modeled by the Wen equation. The continuous liquid mass of the tank is modeled as a sloshing mass, impulsive mass and rigid mass. The corresponding stiffness associated with these masses has been worked out depending upon the properties of the tank wall and liquid mass. The governing equations of motion of the three-degrees-of-freedom model of the isolated liquid storage tank are derived. Since the force-deformation behavior of the bearings is non-linear, as a result, the seismic response is obtained using the Newmark step-by-step method under several recorded earthquake ground motions. The responses of two types of tanks, namely slender and broad, are compared with the corresponding response without an isolation system in order to investigate the effectiveness of the isolation system. A parametric study is also carried out to study the effects of important system parameters on the effectiveness of seismic isolation for liquid storage tanks. The various important parameters considered are the aspect ratio of the tank, period, damping and the yield strength of the isolation system. It has been observed that the seismic isolation of the tanks is quite effective and the response of isolated liquid storage tanks is significantly influenced by the above system parameters. There is an optimum value of isolation damping for which the base shear in the tank attains the minimum value. Therefore, increasing the bearing damping beyond a certain value decreases the bearing and sloshing displacements but it increases the base shear.

Dynamic Analysis of Non-Uniform Continuous Girder Bridge under Moving Vehicle

2011 ◽  
Vol 243-249 ◽  
pp. 1634-1637
Author(s):  
Zhi Gang Chen ◽  
Zi Lin Peng
Keyword(s):  
Dynamic Response ◽  
Dynamic Analysis ◽  
Numerical Solutions ◽  
Lagrange Equation ◽  
Field Testing ◽  
Vehicle Speed ◽  
Analysis Model ◽  
Moving Vehicle ◽  
Continuous Girder Bridge ◽  
The Impact

For non-uniform continuous bridge in actual projects, the theoretical analysis and field testing of the dynamic response under moving vehicle are carried out. Firstly, Euler-Lagrange equation is applied to derive the vibration equation of three-axle vehicle. Then one obtains the dynamic analysis model by using the finite element method and the vehicle-bridge interaction equation based on the displacement coordination relationship of the contact between wheels and bridge. Lastly, numerical solutions are presented according to the dynamic response of the bridge, compared with the real values. The results show that: the roadway roughness and vehicle speed strongly influence the impact factor.

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