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Submitted on: 07 June 2009.
Revised on: 02 August 2009.
Accepted on: 24 August 2009.
___________________ADVANCES IN STRUCTURAL ENGINEERING
Submitted on: 16 December 2014.
Revised on: 05 March 2015.
Accepted on: 11 April 2015.
___________________ADVANCES IN STRUCTURAL ENGINEERING
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