1. Assistant Professor, Dept. of Civil, Architectural and Environmental Engineering, Drexel Univ., 3141 Chestnut St., Curtis Hall 251, Philadelphia, PA 19104 (corresponding author).
2. Assistant Professor, Dept. of Civil, Structural and Environmental Engineering, Univ. at Buffalo, 230 Ketter Hall, North Campus, Buffalo, NY 14260.
3. Graduate Student, NDE and Structural Health Monitoring Laboratory, Dept. of Structural Engineering, Univ. of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0085.
4. Professor, NDEand Structural Health Monitoring Laboratory, Dept. of Structural Engineering, Univ. of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0085.
5. Program Manager, Division of Engineering Services, California Dept. of Transportation, 1801 30th St., P.O. Box 168041, Sacramento, CA 95816-0001.