1. Professor, School of Civil Engineering, Shandong Univ., No. 17922 Jingshi Rd., Jinan 250061, China.
2. Ph.D. Candidate, School of Civil Engineering, Shandong Univ., No. 17922 Jingshi Rd., Jinan 250061, China.
3. State Key Laboratory of Coastal and Offshore Engineering, Dalian Univ. of Technology, No. 2 Linggong Rd., Dalian 116023, China (corresponding author).