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Submitted on: 01 February 1998.
Revised on: 14 May 1998.
Accepted on: 25 June 1998.
___________________Journal of the South African Institution of Civil Engineering
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http://reply.papertrans.cn/2/199/19870/19870-14.png
Submitted on: 06 January 2002.
Revised on: 06 February 2002.
Accepted on: 19 March 2002.
___________________Journal of the South African Institution of Civil Engineering
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Submitted on: 17 July 2004.
Revised on: 29 October 2004.
Accepted on: 25 November 2004.
___________________Journal of the South African Institution of Civil Engineering
Submitted on: 20 December 2013.
Revised on: 27 March 2014.
Accepted on: 17 April 2014.
___________________Journal of the South African Institution of Civil Engineering
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Submitted on: 08 April 2022.
Revised on: 16 May 2022.
Accepted on: 28 May 2022.
___________________Journal of the South African Institution of Civil Engineering