1. Former Graduate Research Assistant, Sonny Astani Dept. of Civil and Environmental Engineering, Univ. of Southern California, 3620 S. Vermont Ave., KAP210, Los Angeles, CA 90089-2531.
2. Professor, Sonny Astani Dept. of Civil and Environmental Engineering, Univ. of Southern California, 3620 S. Vermont Ave., KAP210, Los Angeles, CA 90089-2531 (corresponding author).
3. Associate Professor, Dept. of Civil and Environmental Engineering, Clarkson Univ., Box 5710, 8 Clarkson Ave., Potsdam, NY 13699.