1. Department of Civil Engineering, Indian Institute of Technology Madras, Sardar Patel Rd., Chennai 600036, Tamil Nadu, India
2. Department of Engineering Design, Indian Institute of Technology Madras, Sardar Patel Rd., Chennai 600036, Tamil Nadu, India
3. Department of Engineering Design, Indian Institute of Technology Madras, Sardar Patel Rd., Chennai 600036, Tamil Nadu, India (Corresponding author), e-mail: shankar_sj@iitm.ac.in