1 School of Engineering, University of Guelph, Guelph, ON N1G 2W1, Canada; Building & Const. Engineering Dept., University of Technology, Baghdad, Iraq.
2 School of Engineering, University of Guelph, Guelph, ON N1G 2W1, Canada. Electronic address: rzytner@uoguelph.ca.
3 School of Engineering, University of Guelph, Guelph, ON N1G 2W1, Canada.