0
Research Papers: Seismic Engineering

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

[+] Author and Article Information
Fabrizio Paolacci

Mem. ASME
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.

Copyright © 2015 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

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

Grahic Jump Location
Fig. 2

Lumped mass 3DOF model for nonisolated elevated tanks

Grahic Jump Location
Fig. 3

Lumped mass 4DOF model for isolated elevated tanks

Grahic Jump Location
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).

Grahic Jump Location
Fig. 5

Plan view of the tank

Grahic Jump Location
Fig. 6

Section in the vertical plan of the tank

Grahic Jump Location
Fig. 7

Accelerogram record of Yamarica (330 deg North)

Grahic Jump Location
Fig. 8

Response spectra of the seven unscaled accelerograms

Grahic Jump Location
Fig. 9

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

Grahic Jump Location
Fig. 10

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

Grahic Jump Location
Fig. 14

Cyclic response of an FPS isolator–Duzce270 record

Grahic Jump Location
Fig. 15

Average pressures on the wall–isolated case–FPS isolators

Grahic Jump Location
Fig. 13

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

Grahic Jump Location
Fig. 12

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

Grahic Jump Location
Fig. 16

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

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In