1. Former Graduate Research Assistant, Dept. of Civil Engineering, Indian Institute of Technology Kharagpur, West Bengal 721 302, India; Graduate Research Assistant, School of Civil and Construction Engineering, Oregon State Univ., 101 Kearney Hall, Corvallis, OR 97331.
2. Assistant Professor, Dept. of Civil Engineering, Indian Institute of Technology Kharagpur, West Bengal 721 302, India (corresponding author).