1. Assistant Professor, Pontificia Universidad Catolica de Chile, School of Engineering, Casilla 306, Correo 22, Santiago, Chile (corresponding author).
2. Undergraduate Research Assistant, School of Civil Engineering, Purdue Univ., 550 Stadium Mall Dr., West Lafayette, IN 47907.
3. Professor, Director of Pankow Materials Laboratory, Purdue Univ., 550 Stadium Mall Dr., West Lafayette, IN 47907.