Shaking table test on full-scale legged liquid storage tanks protected with a vertical-rocking isolation system
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2021
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Conference Paper
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Abstract
Legged thin-walled liquid storage tanks have shown in many cases poor seismic performance during several strong earthquakes around the world. The damage and collapse of these containment structures lead to the loss of the liquid, such as milk, wine, and others, thus generating significant economic losses. This damage may also affect components along the production line of other food products, and hence, it is relevant to develop solutions to seismically protect these structures and ensure continuous operation. Consequently, this paper presents the dynamic performance evaluation of a new Vertical-Rocking Isolation system. This evaluation is done by shaking table tests performed on a full-scale legged storage tank. A comparison is presented between the numerical seismic behavior of the fixed-to-the-base configuration of the tank and the experimental one with vertical rocking isolation. The isolation system setup consisted of four ISO3D-2G devices, each one placed on each leg of the tank. The ISO3D-2G device is vertically flexible and laterally stiff, which enables the isolation mechanism of the rocking motion of the tank. The experiments were carried out using a white noise input and three ground motions. The measurements included the acceleration and lateral displacement at the center of mass of the tank. Experimental results confirm the beneficial effects of using a vertical-rocking isolation system in this legged storage tank. Base shear reduction ratios between 5.5 and 8.4 were obtained, which demonstrates that the lateral isolation effect is satisfactory. The use of this device can also be extended to other systems sensitive to rocking motions.
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published
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Proceedings of the Seventeenth World Conference on Earthquake Engineering Japan 2021
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National Information Center of Earthquake Engineering
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17th World Conference on Earthquake Engineering (17WCEE 2020-21)
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Subject
Legged storage tanks; seismic isolation; vertical-rocking isolation; shaking table test
Organisational unit
09663 - Vassiliou, Michalis (ehemalig) / Vassiliou, Michalis (former)
Notes
Conference postponed due to Corona virus (COVID-19), and rescheduled from September 13–18, 2020 to September 27 – October 2, 2021