1. Ph.D. Student, Lyles School of Civil Engineering, Purdue Univ., 550 Stadium Mall Dr., West Lafayette, IN 47907.
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, 851 Neyland Dr., Knoxville, TN 37996.
3. Associate Professor, Lyles School of Civil Engineering, Purdue Univ., 550 Stadium Mall Dr., West Lafayette, IN 47907 (corresponding author).