1. Chief Scientist, Intelligent Solutions, 4030 West 10th Ave., Vancouver BC, Canada V6R 2H1.
2. Manager, Building Systems Dept., Forintek Canada Corp., 2665 East Mall, Vancouver BC, Canada V6T 1W5 (corresponding author). E-mail: erolk@van.forintek.ca
3. Professor, Dept. of Civil Engineering, Univ. of British Columbia, Vancouver BC, Canada V6T 1Z4.
4. Scientist, Building Systems Dept., Forintek Canada Corp., 2665 East Mall, Vancouver BC, Canada V6T 1W5.