1. Graduate Student, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, 325 John Tickle Building, Knoxville, TN 37996.
2. Engineer, VPD-Machine Performance Analysis, Caterpillar, Inc., 140009 Old Galena Rd., Peoria, IL 61552.
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, 325 John Tickle Building, Knoxville, TN 37996 (corresponding author).
4. Associate Professor, Dept. of Civil and Architectural Engineering, Qatar Univ., Doha, Qatar.