Seismic Reliability Analysis of Elevated Liquid‐Storage Vessels

Tung, Albert; Kiremidjian, Anne S.

doi:10.1061/(asce)0733-9445(1991)117:5(1372)

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…Kim and Lee (1995), Malhotra (1997A), Shenton and Hampton (1999), Park et al (2000), Wang et al (2001), Jangid (2002A and2002B), Panchal and Jangid (2008), Almazan et al (2007), Mordini and Strauss (2008) and Shekari et al (2009) studied the effects of base-isolation on the seismic response of liquid storage tanks. Tung and Kiremidjian (1991, Shenton and Hampton (1999), El Damatty (2003 and2005), Livaoglu and Dogangun (2006) and Sezen et al (2008) conducted studies on elevated water tanks. Ma et al (1982), Lepelletier and Raichlen (1988), Amano et al (1993), Chen et al (1996), Yun (1996 and, Warnitchai and Pinkaew (1998), Ryu (1998A and, Isaacson and Premasiri (2001), Pal et al (1999), Hernandez-Barrios et al (2007, Chen et al (2007) and Maleki and Ziyaeifar (2007) studied the effect of sloshing on dynamic response of liquid storage tanks.…”

Section: Other Related Studiesmentioning

confidence: 99%

Generalized SDOF system for dynamic analysis of concrete rectangular liquid storage tanks

Chen¹

2021

Preprint

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Liquid storage tanks are essential facilities in lifeline and industrial systems. To ensure liquid tightness, serviceability is the prime design concern for these structures. While there have been major studies on the behavior of steel tanks, little attention has been paid to the behavior of rectangular concrete tanks. In this study, the dynamic response of concrete rectangular liquid storage tanks is investigated. In the current design practice, the response of liquid and tank structure is determined based on rigid tank wall and the lumped mass approach. However, the results of analysis show that the flexibility of tank wall increases the hydrodynamic pressures as compared to the rigid wall assumption. Also, recent studies show that the lumped added mass method leads to overly conservative results in terms of base shear and base moment. In addition, in spite of advanced analysis techniques available for dynamic analysis of liquid storage tanks such as finite element method and sequential coupling analysis procedure, there is a need to develop a simplified analysis method for practical applications. In this thesis, a simplified method using the generalized single degree of freedom (SDOF) system is proposed for seismic analysis of concrete rectangular liquid containing structures (LCS). Only the impulsive hydrodynamic pressure is considered. In the proposed method, the consistent mass approach and the effect of flexibility of tank wall on hydrodynamic pressures are considered. Different analytical methods are used to verify the proposed model in this study. The comparison of results based on the current design practice, the analytical-finite element models and full finite element model using ANSYS® shows that the proposed method is fairly accurate which can be used in the structural design of liquid containing structures. Parametric studies on seismic analysis of concrete rectangular LCS using the generalized SDOF system are carried out. Five prescribed vibration shape functions representing the first mode shape of fluid structure interaction system are used to study the effect of flexibility of tank wall and boundary conditions. The effect of flexibility of tank wall, the amplitude of hydrodynamic pressure, the added mass of liquid due to hydrodynamic pressure, the effective heights for liquid containing system and the effect of higher modes on dynamic response of LCS are investigated. In addition, the effect of variable size of tanks and liquid depth are studied. The contribution of higher modes to the dynamic response of LCS is included in the proposed model. A design procedure based on the structural model using the generalized SDOF system is proposed in this study. Design charts and tables for the added mass of liquid due to impulsive hydrodynamic pressure and the corresponding effective heights are presented. The proposed design procedure can be used for engineering design applications.

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Section: Other Related Studiesmentioning

confidence: 99%

Generalized SDOF system for dynamic analysis of concrete rectangular liquid storage tanks

Chen¹

2021

Preprint

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“…Ibrahim et al [4] carried out an extensive review of recent advances in fluid sloshing dynamics; further, mass-spring dashpot and pendulum models for modelling sloshing were discussed [5]. Jain and Jaiswal [12] and; Tung and Kiremidjian [13] Shenton III and Hampton [14], Shrimali and Jangid [15,16], Panchal and Jangid [17,18] worked on elevated liquid storage tanks. The primary assumption in all these studies is the staging of the tank is considered as a single degree of freedom system.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Seismic Analysis of RC Elevated Liquid Storage Tanks

2022

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Liquid storage tanks are strategically important due to their essential requirement of service in the post-earthquake situation. Numerical modeling of the liquid storage tank needs special attention and cannot be done in the same manner as that of the conventional buildings. In the present paper, a numerical simulation of the RC elevated liquid storage tank is presented. The staging of the tank is modeled as a multi-degree freedom system, and the container with contained liquid is modeled as a two-mass system. Free vibration analysis of the tank is carried out, and mode shapes are extracted. Further, to study the seismic response of the tank, nonlinear time history analysis is carried out. The tank is subjected to time histories of real earthquake ground motions. The varying level of the liquid in the container is another characteristic feature of tanks. The filled condition of the tank is taken into account by considering the aspect ratio (S), defined as the ratio of height of the liquid to the radius of the container. The response of the tanks with two different aspect ratios viz. 0.5 (broad) and 2.0 (slender) is studied. The linear modal analysis also carried out to understand the significance of nonlinear analysis, particularly in liquid storage tanks. Displacement, velocity, and acceleration response at the bracing levels, as well as at container levels, are obtained. Additionally, the base shear response is also obtained. The effect of aspect ratio on the free vibration analysis and the seismic response of the tanks are presented. Liquid storage tanks are special structures that have typically low fundamental natural frequencies. The nonlinear time history response of the tank showed that the higher displacement and velocity response occurs at the convective level. It is found that the linear modal analysis significantly underestimates the response of the liquid storage tank.

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“…Specifications in international codes such as ACI 350.3 [6], and EN 1998-4 [7] are available for seismic analysis and design of RC liquid storage tanks. Jain and Jaiswal [8] and; Tung and Kiremidjian [9] illustrated the analysis procedure for elevated RC tanks considering two-mass model for liquid and assuming single lumped mass for the staging of the tank. Malhotra [10] carried out studies on ground supported base isolated tanks focusing on base shear, overturning moment, and axial compressive stresses.…”

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confidence: 99%

Influence of Nonlinear Fluid Viscous Dampers on Seismic Response of RC Elevated Storage Tanks

2020

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The numerical investigation on the seismic response of RC elevated liquid storage tanks installed with viscous dampers is presented. A discrete two-mass model for the liquid and multi-degree of freedom system for staging, installed with the dampers are developed for Reinforced Concrete (RC) elevated liquid storage tanks. The elevated tank is assessed for seismic response reduction when provided with Linear Viscous Damper (LVD) and Nonlinear Viscous Damper (NLVD), installed in the staging. The RC elevated liquid storage tanks are analyzed for two levels of liquid containment in the tank, 100% and 25% of the tank capacity. Three Configurations of placements of dampers viz. dampers at alternate levels (Configuration I and Configuration II) and dampers at all the panels of the staging of the tank (Configuration III) are considered. To study the effect of peak ground acceleration, eight real earthquake time histories with accelerations varying from 0.1 g to 0.93 g are considered. The nonlinearity in the viscous damper is modified by taking force proportional to various velocity exponents. It is found that the nonlinear viscous dampers with lower damping constant result in a comparable reduction in the response of RC elevated liquid storage tank, to that of linear viscous dampers with higher damping constant. A lower damping constant signifies compact the size of the damper. Doi: 10.28991/cej-2020-SP(EMCE)-09 Full Text: PDF

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Seismic Reliability Analysis of Elevated Liquid‐Storage Vessels

Cited by 4 publications

References 9 publications

Generalized SDOF system for dynamic analysis of concrete rectangular liquid storage tanks

Generalized SDOF system for dynamic analysis of concrete rectangular liquid storage tanks

Nonlinear Seismic Analysis of RC Elevated Liquid Storage Tanks

Influence of Nonlinear Fluid Viscous Dampers on Seismic Response of RC Elevated Storage Tanks

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