Dynamic performance investigations of a full-scale unanchored thin-walled steel fluid storage tank via shake table tests

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2024-10-24 DOI:10.1016/j.istruc.2024.107548

Seyed Ehsan Aghakouchaki Hosseini, Sherif Beskhyroun

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引用次数: 0

Abstract

Theoretical models proposed in the literature and seismic design codes make the basis of analysis and the design procedures of fluid storage tanks. These models are derived based on many simplified and approximate assumptions. Under realistic conditions, however, different factors cause violation of these assumptions, causing the fluid flow and fluid–structure interaction (FSI) to diverge from theories. In this research work, 38 swept-sine tests and 63 seismic ground motions were applied to a full-scale highly flexible unanchored thin-walled stainless steel fluid tank. The experimental natural frequencies of the system for three different aspect ratios of 2.1, 2.8, and 3.5 were calculated and compared with the theoretical ones. Damping ratios for different modes were calculated using the half-power bandwidth analysis. Experimental results revealed discrepancies between the theoretical and experimentally detected natural frequencies, especially for the convective mode. Closer matches were found for the aspect ratios of 2.8 and 3.5, for the impulsive mode. Acceleration amplification factors at different heights of the shell were calculated which showed a nonlinear behaviour with a descending trend from the base to the mid-height and then an ascending one towards the fluid surface. Maximum acceleration amplification factor occurred at the surface of the fluid. The axial strains around the base are maximum and decrease bi-linearly towards the upper heights of the shell. Effects of the input excitation frequency content over the structural responses of the system were examined. Frequency characteristics of the input excitation considerably affected the maximum acceleration amplification factors and axial strains in the shell.

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通过振动台试验研究全尺寸非锚固薄壁钢制流体储罐的动态性能

文献和抗震设计规范中提出的理论模型是流体储罐分析和设计程序的基础。这些模型是基于许多简化和近似的假设得出的。然而，在现实条件下，不同的因素会导致这些假设被违反，从而使流体流动和流固耦合（FSI）与理论产生偏差。在这项研究工作中，对一个全尺寸高柔性无锚薄壁不锈钢流体槽进行了 38 次正弦扫频试验和 63 次地震地面运动试验。计算了系统在 2.1、2.8 和 3.5 三种不同纵横比下的实验自然频率，并与理论频率进行了比较。使用半功率带宽分析法计算了不同模式的阻尼比。实验结果表明，理论自然频率和实验检测到的自然频率之间存在差异，尤其是对流模式。在长宽比为 2.8 和 3.5 时，脉冲模式的频率比较接近。计算了壳体不同高度的加速度放大系数，结果显示出非线性行为，从底部到中间高度呈下降趋势，然后向流体表面上升。最大加速度放大系数出现在流体表面。基底周围的轴向应变最大，并向壳体的上部高度呈双线性下降。研究了输入激振频率对系统结构响应的影响。输入激励的频率特性极大地影响了壳体的最大加速度放大系数和轴向应变。

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

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.