1. Assistant Professor, Dept. of Civil, Environmental, and Geodetic Engineering, Ohio State Univ., 470 Hitchcock Hall, 2070 Neil Ave., Columbus, OH 43210 (corresponding author).
2. Professor, School of Civil and Environmental Engineering, Georgia Institute of Technology, 790 Atlantic Dr., Atlanta, GA 30332.
3. Principal, Seismic Systems and Engineering Consultants, 8601 Skyline Blvd., Oakland, CA 94611.