Submitted on: 23 April 2007.
Revised on: 05 June 2007.
Accepted on: 24 July 2007.
___________________Earthquake Engineering and Engineering Vibration
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Submitted on: 18 June 1999.
Revised on: 25 July 1999.
Accepted on: 03 September 1999.
___________________Earthquake Engineering and Engineering Vibration
Submitted on: 27 July 2005.
Revised on: 23 September 2005.
Accepted on: 22 October 2005.
___________________Earthquake Engineering and Engineering Vibration
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