Performance of RC elevated liquid storage tanks installed with semi‐active pseudo‐negative stiffness dampers

Waghmare, Manisha V.; Madhekar, Suhasini; Matsagar, Vasant

doi:10.1002/stc.2924

Cited by 11 publications

(3 citation statements)

References 34 publications

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“…The process is updated, and the new solution becomes the previous solution. cos t ns < cos t ps + U f (8) If the new solution does not meet the condition in Equation ( 8), then the solution is not accepted and the cost threshold value is increased to the value given in Equation ( 9):…”

Section: Optimization Methodsmentioning

confidence: 99%

“…The poor seismic performance of these inverted pendulum-type constructions are frequently reported during major earthquakes [1][2][3][4]. The seismic response of concrete and steel tanks was extensively investigated through experimental and numerical methods [5][6][7][8]. Factors that affect the seismic response of tanks include the tank size [9], the soil-structure interaction [10], and the fluid-structure interaction [11].…”

Section: Introductionmentioning

confidence: 99%

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Optimization Design of RC Elevated Water Tanks under Seismic Loads

et al. 2022

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This paper deals with the seismic column design of 35 elevated RC water storage tanks. Tanks comprise a top conic trunk reservoir, a column with variable hollow square cross-sections, and a shallow foundation on a sand layer. The five-column heights considered are 20, 25, 30, 35, and 40 m. The five tanks are subjected to seven degrees of seismic loading characterized by the reference peak ground acceleration in Eurocode 8. The elevated tanks are designed against the full prescriptions of Eurocode 2, Eurocode 8, and the Spaniard Structural Code of Practice. This includes variable loads for seismicity, wind, snow, etc., together with the action of self-weight and dead loads. The optimization design method considered is a variant of the old bachelor algorithm, an adaptive threshold acceptance method with a neighborhood move based on the mutation operator from genetic algorithms. Column results show the high nonlinearity of the problem since the horizontal seismic forces depend on the rigidity and height of the columns. The main features of the optimized tanks give guidance for the practical design of this kind of elevated RC water tank.

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Section: Optimization Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization Design of RC Elevated Water Tanks under Seismic Loads

et al. 2022

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“…The mechanical properties of negative stiffness were introduced into the semi-active systems. Results show that, theoretically, the vibration attenuation performance of such new semi-active systems is almost improved to that of active systems (Hua et al, 2022; Høgsberg, 2011; Javanbakht et al, 2020a, 2020b; Shi et al, 2022; Shi and Zhu, 2017; Waghmare et al, 2022). Yang et al (2021) experimentally verified a new vehicle suspension with a combination of a “semi-active (damping) actuator + negative stiffness actuator,” which provides better vibration-damping performance.…”

Section: Introductionmentioning

confidence: 97%

Pseudo-Active Actuators With Positive-Negative Dampings

Bai,

Chen

2024

Journal of Intelligent Material Systems and Structures

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Although semi-active actuators have the advantages of low power consumption, simple structure, and high reliability, their output force and excitation are always in the same direction, and they can only achieve mechanical properties in the first and third quadrants of the force-velocity diagram. Thence, the performance of semi-active actuator-based systems is incomparable to that of active actuator-based systems. Inspired by the concept of “four-quadrant operation” of active actuators such as motors, this paper proposes the configuration and principle of a pseudo-active actuator with four-quadrant controllability performance. The proposed pseudo-active actuator consists of two secondary semi-active damping actuators and a mechanical compensation mechanism, which can conditionally achieve the characteristics of arbitrary adjustment within the four quadrants of the force-velocity diagrams. Through the mechanical compensation mechanism, the output force of the first semi-active actuator is the same as the excitation direction, and the output force of the second semi-active actuator is opposite to the excitation. Tuning the inputs of the two semi-active actuators allows real-time and continuous control of the mechanical outputs of the pseudo-active actuators in the four-quadrant diagram. Based on the structural principle of the pseudo-active actuator, the mechanical properties of the pseudo-active actuator are analyzed. An experimental test bench is established to verify the controllable mechanical properties of the pseudo-active actuator prototype.

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