1. Associate Professor, Faculty of Engineering, Nueva Granada Military Univ., Carrera 11, No. 101-80, Bogotá 110111, Colombia (corresponding author).
2. Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Waterloo, 200 University Ave. West, Waterloo, ON, Canada N2L 3G1.
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Waterloo, 200 University Ave. West, Waterloo, ON, Canada N2L 3G1.
4. Associate Professor, CONSTRUCT-GEO, Faculty of Engineering (FEUP), Univ. of Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal.