1. Research Scholar, Dept. of Civil Engineering, I.I.T Roorkee, Roorkee 247 667, Uttaranchal, India. E-mail: ihssan62@yahoo.com
2. Professor, Dept. of Civil Engineering, I.I.T Roorkee, Roorkee 247 667, Uttaranchal, India (corresponding author). E-mail: dkashfce@iitr.ernet.in
3. Assistant Professor, Dept. of Civil Engineering, I.I.T Roorkee, Roorkee 247 667, Uttaranchal, India. E-mail: suryafce@iitr.ernet.in