1. Research Associate, School of Civil and Resource Engineering, Univ. of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia. E-mail: zhao@civil.uwa.edu.au
2. Professor, School of Civil and Resource Engineering, Univ. of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia (corresponding author). E-mail: cheng@civil.uwa.edu.au
3. Professor, State Key Laboratory of Coastal and Offshore Engineering, Dalian Univ. of Technology, Dalian 116024, China. E-mail: bteng@dlut.edu.cn