1. Associate Professor, Institute of Structural Engineering, Zhejiang Univ., Hangzhou 310058, P.R. China; formerly, Postdoctoral Fellow, Dept. of Civil, Environmental, and Architectural Engineering, Univ. of Colorado, Boulder, CO 80309 (corresponding author).
2. Professor, Institute of Structural Engineering, Zhejiang Univ., Hangzhou 310058, P.R. China.
3. Professor, School of Marine Science and Engineering, Plymouth Univ., Drake Circus, Plymouth, Devon PL4 8AA, U.K.