Research Papers: Seismic Engineering

On the Effectiveness of Two Isolation Systems for the Seismic Protection of Elevated Tanks

[+] Author and Article Information
Fabrizio Paolacci

Department of Engineering,
Roma Tre University,
Rome 00033, Italy

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received July 4, 2014; final manuscript received January 3, 2015; published online February 12, 2015. Assoc. Editor: Chong-Shien Tsai.

J. Pressure Vessel Technol 137(3), 031801 (Jun 01, 2015) (8 pages) Paper No: PVT-14-1104; doi: 10.1115/1.4029590 History: Received July 04, 2014; Revised January 03, 2015; Online February 12, 2015

This paper deals with the effectiveness of two isolation systems for the seismic protection of elevated steel storage tanks. In particular, the performance of high damping rubber bearings (HDRB) and friction pendulum isolators (FPS) has been analyzed. As case study, an emblematic example of elevated tanks collapsed during the Koaceli Earthquake in 1999 at Habas pharmaceutics plant in Turkey is considered. A time-history analysis conducted using lumped mass models demonstrates the high demand in terms of base shear required to the support columns and their inevitable collapse due to the insufficient shear strength. A proper design of HDRB and FPS isolator according to the EN1998 and a complete nonlinear analysis of the isolated tanks proved the high effectiveness of both isolation systems in reducing the response of the case tank. Actually, the stability conditions imposed by the code and a reduced level of convective base shear obtained with the second isolation typology suggests the use of FPS isolators rather than HDRB devices.

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Fig. 1

Equivalent spring–mass model of elevated tanks: (a) general and (b) broad tanks

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Fig. 2

Lumped mass 3DOF model for nonisolated elevated tanks

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Fig. 3

Lumped mass 4DOF model for isolated elevated tanks

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Fig. 4

Storage tanks of liquid oxygen at Habas plant after the strong event of Itzmit (1999) (courtesy: The Karl V. Steinbrugge slide and photograph collection world earthquakes and earthquake engineering).

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Fig. 5

Plan view of the tank

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Fig. 6

Section in the vertical plan of the tank

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Fig. 7

Accelerogram record of Yamarica (330 deg North)

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Fig. 8

Response spectra of the seven unscaled accelerograms

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Fig. 9

Nonisolated case: time-history of base shear components for Yarimca 330 record

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Fig. 10

Average wall pressures–nonisolated case (a) total, (b) impulsive, and (c) convective

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Fig. 12

Average pressures on the wall–isolated case–HDRB: (a) total, (b) impulsive, and (c) convective

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Fig. 13

Isolated case: time-history of base shear components for Yamarica record–isolated case-FPS

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Fig. 14

Cyclic response of an FPS isolator–Duzce270 record

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Fig. 15

Average pressures on the wall–isolated case–FPS isolators

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Fig. 16

Membrane tensions: (a) HDRB and (b) FPS



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