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Title: | Influence of isolation system characteristic strength on the earthquake behavior of base-isolated liquid storage tanks |
Authors: | Alhan, C Gazi, H Guler, E |
Keywords: | Liquid storage tank;Base-isolation;Characteristic strength |
Issue Date: | Aug-2018 |
Publisher: | NISCAIR-CSIR, India |
Abstract: | Earthquake performance of liquid storage tanks may be substantially improved by base-isolation. However, the possibility of facing large isolator displacements in case of large magnitude near-fault earthquakes threatens the safety of these structures, which may be realized if the period of the velocity pulses that typically exist in the near-fault earthquake records are close to their isolation periods. Increasing isolation system characteristic strength may help reducing the aforementioned large isolator displacements but this in turn may have a negative impact on the superstructure response. Therefore, this study aims to investigate the influence of the characteristic strength of the isolation system on the behavior of base-isolated liquid storage tanks under representative historical near-fault and far-fault earthquakes by making use of a set of benchmark tank models with different levels of isolation system characteristic strength ratios. Numerical modeling and non-linear time history analyses are carried out via the academic software 3DBASIS-ME,which offers the possibility of conducting such modeling and analysis following a highly preferred mechanical analog that is able to take the deformability of the tank wall and sloshing of the fluid into account by considering the fundamental sloshing and fundamental fluid-tank modes of vibration as single degree of freedom systems sharing a common isolation base-mat. The seismic responses including isolation system displacement, sloshing fluid displacement, isolation system shear force, fluid-tank shear force, and sloshing fluid shear force are reported in a comparative manner. Results show that while higher characteristic strength effectively reduces large base displacements observed under near-fault earthquakes, it may cause significant amplifications in the superstructure responses particularly under far-fault earthquakes. |
Page(s): | 346-352 |
URI: | http://nopr.niscair.res.in/handle/123456789/45259 |
ISSN: | 0975-1017 (Online); 0971-4588 (Print) |
Appears in Collections: | IJEMS Vol.25(4) [August 2018] |
Files in This Item:
File | Description | Size | Format | |
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IJEMS 25(4) 346-352.pdf | 1.43 MB | Adobe PDF | View/Open |
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