1. Lecturer, Engineering Faculty, Pontificia Univ. Catolica de Valparaiso, Av. Brasil 2147, Valparaiso, Chile; and, Lecturer, Civil Engineering School, Univ. Diego Portales, Ejercito Libertador 441, Santiago, Chile; formerly, Graduate Student, Dept. of Structural and Geotechnical Engineering, Pontificia Univ. Catolica de Chile, Vicuna Mackena 4860, Macul, Santiago, Chile.
2. Assistant Professor, Dept. of Structural and Geotechnical Engineering, Pontificia Univ. Catolica de Chile, Vicuna Mackena 4860, Macul, Santiago, Chile.