1. Armour T. Granger Professor of Civil and Environmental Engineering, Dept. of Civil and Environmental Engineering, 223 Perkins Hall, Univ. of Tennessee, Knoxville, TN 37996-2010 (corresponding author).
2. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, 223 Perkins Hall, The Univ. of Tennessee, Knoxville, TN 37996.