1. Department of Civil and Natural Resources Engineering, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand e-mail:
2. Professor Department of Civil and Natural Resources Engineering, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand
3. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon 999077, Hong Kong
4. Department of Civil and Natural Resources Engineering, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand
5. Professor Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon 999077, Hong Kong
6. Dipartimento di Ingegneria Civile Ambientale, Universitá degli Studi di Perugia, Perugia 06123, Italy
7. Professor Dipartimento di Ingegneria Civile Ambientale, Universitá degli Studi di Perugia, Perugia 06123, Italy