1. Assistant Professor, Dept. of Civil Engineering, Indian Institute of Technology Madras, Chennai 600 036, India.
2. University Distinguished Professor and Forsyth Chair Professor, Dept. of Mechanical Engineering, Texas A&M Univ., College Station, TX 77843, (corresponding author).
3. Snead Chair Professor, Dept. of Civil Engineering and Texas Transportation Institute, Texas A&M Univ., College Station, TX 77843.