1. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Delaware, 301 Dupont Hall, Newark, DE 19716 (corresponding author).
2. Professor, Dept. of Civil and Environmental Engineering, Univ. of Delaware, 301 Dupont Hall, Newark, DE 19716.
3. Structural Engineer, Naval Surface Warfare Center Carderock, 9500 Macarthur Blvd., Bethesda, MD 20817; formerly, Graduate Research Assistant, Univ. of Delaware, Newark, DE 19716.