1. Faculty of Engineering, University of Wollongong, Wollongong, NSW 2522, Australia.
2. School of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an Shaanxi 710055, PRC; School of Civil, Mining and Environmental Engineering, Faculty of Engineering, University of Wollongong, Wollongong, NSW 2522, Australia.
3. School of Civil, Mining and Environmental Engineering, Faculty of Engineering, University of Wollongong, Wollongong NSW 2522, Australia.