1. Assistant Professor, Dept. of Civil and Environmental Engineering, The Pennsylvania State Univ., 223B Sackett Building, University Park, PA 16802 (corresponding author).
2. Ph.D. Student, Dept. of Civil and Environmental Engineering, Univ. of Hawaii–Manoa, 2540 Dole St., Holmes 383, Honolulu, HI 96822.
3. Associate Professor, Dept. of Civil Engineering, Technical Univ. of Denmark, Building 118, 2800 Kgs. Lyngby, Denmark.