1. Professor, State Key Laboratory of Coastal and Offshore Engineering, Dalian Univ. of Technology, Dalian 116024, P.R. China. E-mail: zhiminwu2002@yahoo.com.cn
2. Ph.D. Student, State Key Laboratory of Coastal and Offshore Engineering, Dalian Univ. of Technology, Dalian 116024, P.R. China. E-mail: yangshutong1979@yahoo.com.cn
3. Professor, Dept. of Mechanical and Materials Engineering, Univ. of Western Australia, Nedlands, Perth, WA 6907, Australia. E-mail: xhu@mech.uwa.edu.au
4. Professor, School of Civil Engineering and Architecture, Zhejiang Univ. of Technology, Hangzhou 310014, P.R. China. E-mail: jjzheng@zjut.edu.cn