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