Submitted on: 21 March 2000.
Revised on: 11 June 2000.
Accepted on: 18 July 2000.
___________________Journal of Mechanics of Materials and Structures
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Submitted on: 07 May 1998.
Revised on: 12 August 1998.
Accepted on: 25 September 1998.
___________________Journal of Mechanics of Materials and Structures
Submitted on: 07 June 2012.
Revised on: 08 September 2012.
Accepted on: 07 November 2012.
___________________Journal of Mechanics of Materials and Structures
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Submitted on: 29 December 1999.
Revised on: 12 April 2000.
Accepted on: 26 April 2000.
___________________Journal of Mechanics of Materials and Structures