1. Dept. of Civil and Environmental Engineering, Carnegie Mellon Univ., 5000 Forbes Ave., Pittsburgh, PA 15213; presently, Quantitative Analyst, Senior Associate, Morgan Stanley Alternative Investment Partners, One Tower Bridge, 100 Front St., West Conshohocken, PA.
2. Doctoral Student, Dept. of Civil and Environmental Engineering, Davis Hall, Univ. of California, Berkeley, CA 94720 and Dept. of Civil and Environmental Engineering, Carnegie Mellon Univ., 5000 Forbes Ave., Pittsburgh, PA 15213 (corresponding author).
3. Associate Professor, Dept. of Civil and Environmental Engineering and Dept. of Engineering and Public Policy, Carnegie Mellon Univ., 5000 Forbes Avenue, Pittsburgh, PA 15213.
4. Professor, Dept. of Civil and Environmental Engineering, Carnegie Mellon Univ., 5000 Forbes Ave., Pittsburgh, PA. 15213.
5. Professor, Dept. of Civil and Environmental Engineering, Carnegie Mellon Univ., 5000 Forbes Ave., Pittsburgh, PA. 15213,