1. Dept. of Civil Engineering, Indian Institute of Technology, Kharagpur 721302, India (corresponding author).
2. School of Civil and Environmental Engineering, Univ. of New South Wales, Sydney, NSW 2052, Australia.
3. Dept. of Civil Engineering, Indian Institute of Science, Bangalore 560012, India.
4. Dept. of Civil Engineering, Indian Institute of Technology, Kharagpur 721302, India.