1. Research Associate, Centre for Infrastructure Performance and Reliability, School of Engineering, Univ. of Newcastle, University Dr., Callaghan, NSW 2308, Australia (corresponding author).
2. Associate Professor, Centre for Infrastructure Performance and Reliability, School of Engineering, Univ. of Newcastle, University Dr., Callaghan, NSW 2308, Australia.
3. Research Associate, Centre for Infrastructure Performance and Reliability, School of Engineering, Univ. of Newcastle, University Dr., Callaghan, NSW 2308, Australia.
4. Emeritus Professor, Centre for Infrastructure Performance and Reliability, School of Engineering, Univ. of Newcastle, University Dr., Callaghan, NSW 2308, Australia.