1. Faculty Member, Dept. of Civil Engineering, Institute of Technology, Banaras Hindu Univ., Varanasi-05, India (corresponding author). E-mail: drsekaran@sify.com
2. Professor, Dept. of Civil Engineering, Indian Institute of Technology, Hauz Khas, New Delhi-16, India. Email: akjain@civil.iitd.ernet.in
3. Research Scholar, Dept. of Civil Engineering, Institute of Technology, Banaras Hindu Univ., Varanasi-05, India. Email: narayanch@rediffmail.com