1. Research Scholar, Dept. of Civil Engineering, Indian Institute of Technology, Kanpur 208016, India. E-mail: kousik_deb@rediffmail.com
2. Professor, Dept. of Civil Engineering, Indian Institute of Technology, Kanpur 208016, India. E-mail: pkbd@iitk.ac.in
3. Professor, Dept. of Civil Engineering, Indian Institute of Technology, Kanpur 208016, India. (corresponding author). E-mail: sarv@iitk.ac.in