1. Prof. and Head, Div. of Struct. and Mech., School of Civ. and Struct. Engrg., Nanyang Technol. Univ., Blk N1 #1C-87, Nanyang Ave., Singapore 639798.
2. Assoc. Prof., Dept. of Civ. Engrg., Indian Inst. of Technol., Delhi, India; currently, Visiting Teaching Fellow, Div. of Struct. and Mech., School of Civ. and Struct. Engrg., Nanyang Technol. Univ., Blk N1 #1C-87, Nanyang Ave., Singapore 639798.