1. Assistant Professor, Dept. of Civil and Environmental Engineering, Tufts Univ., 200 College Ave., Medford, MA 02155.
2. Associate Bridge Engineer, AECOM Transportation, 999 Town & Country Road, Orange, CA 92868.
3. Professor, Dept. of Structural Engineering, Univ. of California at San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0085 (corresponding author).
4. Professor, Dept. of Structural Engineering, Univ. of California at San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0085.
5. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of California at Berkeley, 747 Davis Hall, Berkeley, CA 94720-1710.