Submitted on: 04 October 2003.
Revised on: 18 January 2004.
Accepted on: 15 March 2004.
___________________International Journal of Civil Engineering
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Submitted on: 24 October 2012.
Revised on: 06 December 2012.
Accepted on: 31 December 2012.
___________________International Journal of Civil Engineering
Submitted on: 06 August 2012.
Revised on: 03 September 2012.
Accepted on: 29 October 2012.
___________________International Journal of Civil Engineering
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