1. Ph.D. Research Scholar, Dept. of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110 016, India.
2. Associate Professor, Dept. of Applied Mechanics, Visvesvaraya National Institute of Technology, Nagpur, Maharashtra 440 010, India.
3. Professor, Dept. of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110 016, India (corresponding author).