1. M.Sc., Director of Operations, Resinsa–Polytan, Santiago 7630628, Chile.
2. Lecturer, Dept. of Civil and Environmental Engineering, Univ. of Auckland, Auckland 1142, New Zealand (corresponding author).
3. Stanton Lewis Chair and Professor, Dept. of Civil, Environmental and Architectural Engineering, Univ. of Colorado, Boulder, CO 80309-0428.
4. Assistant Professor, Faculty, Escuela de Ingeniería, Univ. Panamericana Campus Guadalajara, Guadalajara 45010, México.