Seismic Analysis of Steel Cylindrical Liquid Storage Tank Using Coupled Acoustic-Structural Finite Element Method For Fluid-Structure Interaction

IF 0.8 4区工程技术 Q4 ACOUSTICS

International Journal of Acoustics and Vibration Pub Date : 2020-03-30 DOI:10.20855/ijav.2020.25.11499

A. Rawat, V. Matsagar, A. K. Nagpal

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引用次数: 8

Abstract

A seismic analysis of ground-supported, three-dimensional (3-D) rigid-base steel cylindrical liquid storage tank is investigated, using a coupled acoustic-structural finite element (FE) method for fluid-structure interaction (FSI). In this method, the contained liquid in the tank is modelled using acoustic elements and the cylindrical tank is modelled using shell elements. The impulsive and convective terms are estimated separately by using the appropriate boundary conditions on the free surface of the liquid. The convergence and validation studies of the proposed FE model are conducted by comparing the results reported in the literature. The parametric studies are performed for rigid and flexible tanks for the varying slenderness of the open roof tanks. The sloshing displacement and base shear time history responses are evaluated for the 3-D tanks subjected to harmonic unidirectional ground motions. Further, the results are compared with the commonly used two and three lumped-mass models of the tank. Moreover, the seismic response quantities of the tank subjected simultaneously to the bi-directional horizontal components of earthquake ground motion are also investigated using the 3-D FE model, and the response quantities are compared with the lumped-mass models. The results obtained from the 3-D FE model and lumpedmass model are in close agreement. The average percentage difference in the 3-D FE and lumped-mass models for maximum sloshing displacement prediction is 15 percent to 20 percent and that for the base shear is about 4 to 10 percent, in the case of the uni-directional harmonic ground motions. It is concluded that the sloshing displacement is not affected by the tank flexibility, but the impulsive hydrodynamic pressure and the impulsive component of the base shear increases with the tank flexibility.

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钢制圆柱形储液罐流固耦合有限元地震分析

采用流体-结构相互作用的声-结构耦合有限元方法，对地面支撑的三维刚基钢制圆柱形储液罐进行了地震分析。在该方法中，使用声学元件对储罐中的容纳液体进行建模，并且使用壳体元件对圆柱形储罐进行建模。通过使用液体自由表面上的适当边界条件，分别估计了脉冲项和对流项。通过比较文献中报道的结果，对所提出的有限元模型进行了收敛性和验证研究。针对不同长细比的开顶储罐，对刚性和柔性储罐进行了参数研究。对三维储罐在简谐单向地面运动作用下的晃动位移和基底剪切时程响应进行了评估。此外，将结果与常用的储罐的两个和三个集中质量模型进行了比较。此外，还利用三维有限元模型研究了储罐在地震动双向水平分量作用下的地震反应量，并与集中质量模型进行了比较。从三维有限元模型和块体模型得到的结果非常一致。在单向谐波地面运动的情况下，用于最大晃荡位移预测的三维有限元和集中质量模型中的平均百分比差异为15%至20%，而用于基底剪切的平均百分比差约为4%至10%。结果表明，晃动位移不受储罐柔性的影响，但冲击水动力压力和基底剪切力的冲击分量随储罐柔性的增加而增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Acoustics and Vibration ACOUSTICS-ENGINEERING, MECHANICAL

CiteScore

1.60

自引率

10.00%

发文量

审稿时长

12 months

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