1. Doctoral Student, Dept. of Civil Engineering, Indian Institute of Technology, Delhi 110 016, India.
2. Doctoral Student, Dept. of Applied Mechanics, S. V. National Institute of Technology, Surat, Gujarat 395007, India.
3. Associate Professor, Dept. of Applied Mechanics, S. V. National Institute of Technology, Surat, Gujarat 395007, India (corresponding author).
4. Professor, Dept. of Civil Engineering, Indian Institute of Technology, Delhi 110 016, India.