1. Assistant Professor, Dept. of Civil Engineering, The Univ. of Hong Kong, Pokfulam Rd., China (corresponding author).
2. Senior Research Assistant, Dept. of Civil Engineering, The Univ. of Hong Kong, Pokfulam Rd., China.
3. Ph.D. Candidate, Dept. of Civil Engineering, The Univ. of Hong Kong, Pokfulam Rd., China.