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Submitted on: 18 March 1998.
Revised on: 21 April 1998.
Accepted on: 15 May 1998.
___________________Civil Engineering Infrastructures Journal-CEIJ
Submitted on: 04 October 2020.
Revised on: 02 November 2020.
Accepted on: 20 November 2020.
___________________Civil Engineering Infrastructures Journal-CEIJ
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Submitted on: 08 August 2005.
Revised on: 20 November 2005.
Accepted on: 22 December 2005.
___________________Civil Engineering Infrastructures Journal-CEIJ