Non-linear seismic response of base-isolated liquid storage tanks to bi-directional excitation

Shrimali, Mahendra Kumar; Jangid, R. S.

doi:10.1016/s0029-5493(02)00134-6

Cited by 87 publications

(20 citation statements)

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“…The study indicated that the isolation is quite effective in reducing the axial stresses of cylindrical shell. Recently, Shrimali and Jangid [13][14] investigated the response of slender and broad liquid storage tanks under bi-directional earthquake motion to study the interaction effects of restoring forces of the isolators, although the above studies confirm that the seismic isolation is effective in reducing the earthquake response of the ground supported tanks. However, very limited studies were conducted to investigate the effects of seismic isolation on the response of elevated liquid storage tanks.…”

Section: Introductionmentioning

confidence: 99%

Earthquake response of isolated elevated liquid storage steel tanks

Shrimali

Jangid

2003

Journal of Constructional Steel Research

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Earthquake response of elevated liquid storage steel tanks isolated by the linear elastomeric bearings is investigated under real earthquake ground motion. Two types of isolated tank models are considered in which the bearings are placed at the base and top of the steel tower structure. The continuous liquid mass of the tank is modelled as lumped masses known as sloshing mass, impulsive mass and rigid mass. The corresponding stiffness constants associated with these lumped masses have been worked out depending upon the properties of the tank wall and liquid mass. The mass of steel tower structure is lumped equally at top and bottom. Since the damping matrix of the isolated tank system is non-classical in nature, the seismic response is obtained by the Newmark's step-by-step method. The response of two types of tanks, namely slender and broad tanks, is obtained and a parametric study is carried out to study the effects of important system parameters on the effectiveness of seismic isolation. The various important parameters considered are the tank aspect ratio, the time period of tower structure, damping and the time period of isolation system. It has been shown that the earthquake response of the isolated tank is significantly reduced. Further, it is also observed that the isolation is more effective for the tank with stiff steel tower structure in comparison to flexible towers. In addition, a simplified analysis is also presented to evaluate the response of the elevated steel tanks using two-degrees-of-freedom model and two single-degree-of-freedom models. It is observed that the proposed analysis predicts the seismic response of elevated steel tanks accurately with significantly less computational efforts.

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Section: Introductionmentioning

confidence: 99%

Earthquake response of isolated elevated liquid storage steel tanks

Shrimali

Jangid

2003

Journal of Constructional Steel Research

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“…The tank wall considered is made of steel with a modulus of elasticity of E = 200 GPa and mass density, ρ s = 7900 kg/m 3 . The properties of the broad and slender tanks taken from Shrimali and Jangid (2002) are: (i) aspect ratio, S for slender and broad tanks is 1.85 and 0.6, respectively; (ii) the height, H, of water filled in the slender and broad tanks is 11.3 and 14.6 m, respectively; (iii) the natural frequencies of convective mass, ω c and impulsive mass, ω i for the broad and slender tank are 0.123, 3.944 Hz and 0.273, 5.963 Hz, respectively; and (iv) the ratio of tank wall thickness to its radius, t h \R is taken as 0.004 for both the tanks. Note that the same value of t h \R = 0.004 is used in deriving Eqs.…”

Section: Numerical Studymentioning

confidence: 99%

“…Wang et al (2001) investigated the response of liquid storage tanks isolated by friction pendulum system (FPS) and observed that the isolation was effective in reducing the response of the tanks. Shrimali and Jangid (2002) investigated the seismic response of liquid storage tanks isolated by lead-rubber bearings under bi-directional earthquake excitation and observed that the seismic response of isolated tanks is insensitive to interaction effect of the bearing forces. Shrimali and Jangid (2004) presented the earthquake analysis of base-isolated liquid storage tanks using linear theory of base isolation.…”

Section: Introductionmentioning

confidence: 99%

Variable friction pendulum system for seismic isolation of liquid storage tanks

Panchal

Jangid

2008

Nuclear Engineering and Design

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“…Based on the observations of several other researchers [7][8][9][10], the failure modes of tank damage can be divided into several types, such as buckling of tank walls, failure of link facilities, spillover of stored liquid, and uplifting of anchorage systems. Strengthening, isolation, and hybrid methods have been promoted by several researchers to ensure that storage tanks are not damaged during earthquakes [11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Demand-Based Optimal Design of Storage Tank with Inerter System

Zhang

Zhao

2017

Shock and Vibration

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A parameter optimal design method for a tank with an inerter system is proposed in this study based on the requirements of tank vibration control to improve the effectiveness and efficiency of vibration control. Moreover, a response indicator and a cost control indicator are selected based on the control targets for liquid storage tanks for simultaneously minimizing the dynamic response and controlling costs. These indicators are reformulated through a random vibration analysis under virtual excitation. The problem is then transformed from a multiobjective optimization problem to a single-objective nonlinear problem using the -constraint method, which is consistent with the demand-based method. White noise excitation can be used to design the tank with the inerter system under seismic excitation to simplify the calculation. Subsequently, a MATLAB-based calculation program is compiled, and several optimization cases are examined under different excitation conditions. The effectiveness of the demand-based method is proven through a time history analysis. The results show that specific vibration control requirements can be met at the lowest cost with a simultaneous reduction in base shears and overturning base moments.

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Non-linear seismic response of base-isolated liquid storage tanks to bi-directional excitation

Cited by 87 publications

References 20 publications

Earthquake response of isolated elevated liquid storage steel tanks

Earthquake response of isolated elevated liquid storage steel tanks

Variable friction pendulum system for seismic isolation of liquid storage tanks

Demand-Based Optimal Design of Storage Tank with Inerter System

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