1. Heriot-Watt Univ., School of the Built Environment, Civil Engineering Dept., PO Box: 294345, Dubai, UAE (corresponding author).
2. Faculty of Engineering and Industrial Sciences, Swinburne Univ. of Technology, Hawthorn, Melbourne, Victoria 3122, Australia.
3. Heriot-Watt Univ., School of the Built Environment, Civil Engineering Dept., PO Box: 294345, Dubai, UAE.