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Submitted on: 30 August 2010.
Revised on: 30 October 2010.
Accepted on: 20 December 2010.
___________________CIVIL ENGINEERING---ASCE-AMER SOC CIVIL ENGINEERS
Submitted on: 23 October 2007.
Revised on: 28 November 2007.
Accepted on: 09 January 2008.
___________________CIVIL ENGINEERING---ASCE-AMER SOC CIVIL ENGINEERS
Submitted on: 24 December 1998.
Revised on: 18 February 1999.
Accepted on: 17 April 1999.
___________________CIVIL ENGINEERING---ASCE-AMER SOC CIVIL ENGINEERS
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Submitted on: 08 November 2010.
Revised on: 03 January 2011.
Accepted on: 27 February 2011.
___________________CIVIL ENGINEERING---ASCE-AMER SOC CIVIL ENGINEERS