1. Professor, Dept. of Civil Engineering, TKM College of Engineering, Kollam, Kerala, IN (Formerly Research Scholar, Dept. of Civil Engineering, IIT Madras, Chennai 600 036, India), e-mail: bushrasheik@gmail.com
2. Associate Professor, Dept. of Civil Engineering, IIT Madras, Chennai 600 036, IN (Corresponding author), e-mail: robinson@iitm.ac.in