1. Research Assistant, Dept. of Civil and Environmental Engineering, The Univ. of Wisconsin–Madison, 2210 Engineering Hall, 1415 Engineering Dr., Madison, WI 53706; and, Academic Instructor, Dept. de Obras Civiles, Univ. Técnica Federico Santa Maria, Chile. E-mail: radelgadillo@wisc.edu
2. Professor, Dept. of Civil and Environmental Engineering, The Univ. of Wisconsin–Madison, 3350 Engineering Hall, 1415 Engineering Dr., Madison, WI 53706. E-mail: bahia@engr.wisc.edu