1. Assistant Professor, Dept. of Civil Engineering, Universidad Industrial de Santander–Colombia, Carrera 27, Calle 9 Bucaramanga, Colombia; and Ph.D. Candidate, Dept. of Civil, Construction and Environmental Engineering, Univ. of Alabama, P.O. Box 870205, Tuscaloosa, AL 35487-0205.
2. Assistant Professor, Del E. Webb School of Construction, School of Sustainable Engineering and the Built Environment, Arizona State Univ., Tempe, AZ 85287-0204 (corresponding author).
3. M.S. Student, Dept. of Construction, Georgia Institute of Technology, 247 4th St. NW, Suite 351, Atlanta, GA 30332-0155.
4. Assistant Professor, Dept. of Mathematics, Universidad Industrial de Santander–Colombia, Carrera 27, Calle 9 Bucaramanga, Colombia.