1. Professor, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, 325 John Tickle Bldg., Knoxville, TN 37996 (corresponding author).
2. Graduate Student, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, 325 John Tickle Bldg., Knoxville, TN 37996.
3. Associate Professor, Dept. of Civil and Architectural Engineering, Qatar Univ., Doha 2713, Qatar.