1. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Tennessee Knoxville, 223 Perkins Hall, Knoxville, TN 37996-2010 (corresponding author).
2. Graduate Student, Dept. of Civil and Environmental Engineering, Univ. of Tennessee Knoxville, 223 Perkins Hall, Knoxville, TN 37996-2010.
3. Assistant Professor, School of Civil Engineering, Dalian Univ. of Technology, 2 Linggong Rd., Dalian, P. R. China 116024; formerly, Doctoral Candidate, Dept. of Civil and Environmental Engineering, Univ. of Tennessee Knoxville, 223 Perkins Hall, Knoxville, TN 37996-2010.
4. Doctoral Candidate, Dept. of Civil and Environmental Engineering, Univ. of Tennessee Knoxville, 223 Perkins Hall, Knoxville, TN 37996-2010.
5. Professor, Dept. of Civil and Environmental Engineering, Univ. of Tennessee Knoxville, 223 Perkins Hall, Knoxville, TN 37996-2010.
6. Professor, Dept. of Civil Engineering, Univ. of Minnesota, 122 CivE Bldg., 500 Pillsbury Dr. S. E., Minneapolis, MN 55455-0220.