1. Principal, RSR Rungta College of Engineering and Technology, Bhilai, Chattisgarh, India.
2. Associate Professor, Dept. of Civil Engineering, Indian Institute of Technology, Kharagpur, India 721302 (corresponding author).
3. Professor, Dept. of Civil Engineering and Geodesy, Darmstadt Univ. of Technology, Petersenstr. 30, 64287 Darmstadt, Germany.