Submitted on: 13 September 1998.
Revised on: 03 December 1998.
Accepted on: 27 December 1998.
___________________International Journal of Steel Structures
http://reply.papertrans.cn/2/142/14158/14158-12.png
http://reply.papertrans.cn/2/142/14158/14158-13.png
http://reply.papertrans.cn/2/142/14158/14158-14.png
Submitted on: 31 January 2012.
Revised on: 30 May 2012.
Accepted on: 15 June 2012.
___________________International Journal of Steel Structures
http://reply.papertrans.cn/2/142/14158/14158-16.png
http://reply.papertrans.cn/2/142/14158/14158-17.png
http://reply.papertrans.cn/2/142/14158/14158-18.png
http://reply.papertrans.cn/2/142/14158/14158-19.png
http://reply.papertrans.cn/2/142/14158/14158-20.png