Performance of elevated tanks in Mw 7.7 Bhuj earthquake of January 26th, 2001
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Performance of elevated tanks in Mw 7.7 Bhuj earthquake of January 26th, 2001
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Performance of elevated tanks in Mw 7.7 Bhuj earthquake of January 26th, 2001

Author: Proc. Indian Acad. Sci. (Earth Planet. Sci.), 112, No. 3, September 2003, pp. 421{429 | Size: 988 KB | Format: PDF | Quality: Unspecified | Publisher: Durgesh C Rai Department of Civil Engineering, Indian Institute of Technology, Kanpur 208 016, India. | Year: 2013 | pages: 09

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The current designs of supporting structures of elevated water tanks are extremely vulnerable under lateral forces due to an earthquake and the Bhuj earthquake provided another illustration when a great many water tank stagings su ered damage and a few collapsed. The more popular shaft type stagings su er from poor ductility of thin shell sections besides low redundancy and toughness whereas framed stagings consist of weak members and poor brace-column joints. A strength analysis of a few damaged shaft type stagings clearly shows that all of them either met or exceeded the strength requirements of IS:1893{1984, however, they were all found de cient when compared with requirements of the International Building Code. IS:1893{1984 is unjusti ably low for these systems which do not have the advantage of ductility and redundancy and are currently being underestimated at least by a factor of 3 and need an upward revision of forces immediately.


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