1. Professor, Dept. of Civil and Environmental Engineering, Bucknell Univ., Lewisburg, PA 17837 (corresponding author).
2. Assistant Professor, Dept. of Engineering and Physics, Elizabethtown College, Elizabethtown, PA 17022.
3. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, Knoxville, TN 37996.
4. Research Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, Knoxville, TN 37996.