1. PhD Student, Dept. of Civil Engineering, The Univ. of Hong Kong, Pokfulam Rd., Hong Kong.
2. Assistant Professor, Dept. of Civil Engineering, The Univ. of Hong Kong, Pokfulam Rd., Hong Kong (corresponding author).
3. MACI, Associate Professor, Dept. of Civil Engineering, The Univ. of Hong Kong, Pokfulam Rd., Hong Kong.