1. Hydromechanics Dept., Naval Surface Warfare Center Carderock Division, W. Bethesda, MD 20817; formerly, School of Civil and Construction Engineering, Oregon State Univ., Corvallis, OR 97331 (corresponding author).
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Delaware, Newark, DE 19716.
3. Professor, School of Civil and Construction Engineering, Oregon State Univ., Corvallis, OR 97331.
4. Professor and Slayden Construction Faculty Fellow, School of Civil and Construction Engineering, Oregon State Univ., Corvallis, OR 97331.