1. MASc, Design Engineer, Basler & Hofmann AG Consulting Engineers, Bachweg 1, CH-8133 Esslingen, CH, e-mail: marcel.luethi@baslerhofmann.ch
2. PhD, P.Eng., Professor of Civil Engineering, Univ. of British Columbia, Dept. of Civil Engineering, 6250 Applied Science Ln., Vancouver, British Columbia, CA V6T 1Z4, (Corresponding author) e-mail: jonathan.fannin@civil.ubc.ca
3. PhD, P.Eng., Professor of Civil Engineering, Univ. of British Columbia, Dept. of Civil Engineering, currently with Golder Associates Ltd., 500-4260 Still Creek Drive, Burnaby, British Columbia, CA V5C 6C6, e-mail: rmillar@golder.com