1. Associate Professor, Division of Structures and Mechanics, School of Civil and Environmental Engineering, Nanyang Technological Univ., 50 Nanyang Ave., Singapore 639798 (corresponding author).
2. Research Student, Division of Structures and Mechanics, School of Civil and Environmental Engineering, Nanyang Technological Univ., 50 Nanyang Ave., Singapore 639798.
3. Research Fellow, Division of Structures and Mechanics, School of Civil and Environmental Engineering, Nanyang Technological Univ., 50 Nanyang Ave., Singapore 639798.
4. Assistant Professor, Division of Structures and Mechanics, School of Civil and Environmental Engineering, Nanyang Technological Univ., 50 Nanyang Ave., Singapore 639798.