1. Professor, Centre for Offshore Foundation Systems, The Univ. of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia (corresponding author).
2. Senior Engineer, Keppel Offshore and Marine, Offshore Technology Development Pty. Ltd., 50 Gul Rd., Singapore 628130.
3. General Manager, Keppel Offshore and Marine, Offshore Technology Development Pty Ltd., 50 Gul Rd., Singapore 628130.