1. Assistant Professor, Dept. of Civil Engineering, College of Engineering Trivandrum, Thiruvananthapuram 695 008, Kerala, India (corresponding author).
2. Professor, Dept. of Civil Engineering, Indian Institute of Technology Madras, Chennai 600 036, Tamil Nadu, India.
3. Senior Lecturer, School of Engineering and Information Technology, Univ. of New South Wales at the Australian Defence Force Acedemy, Northcott Drive, Canberra, ACT 2600, Australia.