1. Reader, School of the Built Environment, Heriot-Watt Univ., Edinburgh EH14 4AS, U.K. (corresponding author).
2. Ph.D. Student, Dept. of Structural Engineering and Construction Management, Faculty of Civil and Environmental Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel.
3. Professor and Director, Centre for Infrastructure Performance and Reliability, School of Engineering, The Univ. of Newcastle, Callaghan, NSW 2308, Australia.