1. Assistant Professor, Dept. of Civil and Construction Engineering, Oregon State University, 220 Owen Hall, Corvallis, OR 97331 (corresponding author).
2. Associate Professor, Dept. of Structural Engineering, Univ. of California, San Diego, 9500 Gilman Dr. MC0085, La Jolla, CA 92093-0085.
3. Doctoral Candidate, Dept. of Structural Engineering, Univ. of California, San Diego, 9500 Gilman Dr. MC0085, La Jolla, CA 92093-0085.