1. Associate Professor, School of Civil and Environmental Engineering, Nanyang Technological Univ., Singapore 639798, Singapore (corresponding author). E-mail: cbli@ntu.edu.sg
2. Senior Engineer, J.P. Kenny Pty Ltd, Middlesex TW18 3DT, U.K. E-mail: Zhiwei.Huang@jpkenny.com
3. Research Fellow, School of Civil and Environmental Engineering, Nanyang Technological Univ., Singapore 639798, Singapore. E-mail: CheeLeong@ntu.edu.sg