1. Jack H. Samples Distinguished Professor, Dept. of Civil & Environmental Engineering, West Virginia Univ., Morgantown, WV 26506.
2. Assistant Professor, Weisberg Division of Engineering, Marshall Univ., Huntington, WV 25755 (corresponding author).
3. Professor, Dept. of Civil & Architectural Engineering, Univ. of Wyoming, Laramie, WY 82071.