1. Ph.D. Student, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, Knoxville, 223 Perkins Hall, Knoxville, TN 37996-2010.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, Knoxville, 223 Perkins Hall, Knoxville, TN 37996-2010 (corresponding author).