1. Professor and Structures Group Chief, Engineering Faculty, Pontificia Universidad Javerian, Carrera 7 No. 40-62, Edificio Gabriel Maldonado Piso 1, Bogotá 001, Colombia.
2. Professor and Structures Group Member, Engineering Faculty, Pontificia Universidad Javeriana, Carrera 7 No. 40-62, Edificio Gabriel Maldonado Piso 1, Bogotá 001, Colombia (corresponding author).
3. Professor and Chairman, Dept. of Civil, Architectural, and Environmental Engineering, Illinois Institute of Technology, Chicago, IL 60616.