1. Ph.D. Candidate, Institute of Road and Bridge Engineering, Dalian Maritime Univ., Dalian 116026, China.
2. Professor, Institute of Road and Bridge Engineering, Dalian Maritime Univ., Dalian 116026, China.
3. Professor, Mechanical Engineering Dept., City College of New York, City Univ. of New York, New York, NY 10031 (corresponding author).