1. Ph.D. Candidate, School of Civil, Mining and Environmental Engineering, Univ. of Wollongong, Wollongong, NSW 2522, Australia; formerly, Lecturer, Faculty of Civil Engineering, Ho Chi Minh Univ. of Technology, Ho Chi Minh City, Vietnam.
2. Associate Professor, School of Civil, Mining and Environmental Engineering, Univ. of Wollongong, NSW 2522, Australia (corresponding author).