1. Assistant Professor, Whitaker School of Engineering, Florida Gulf Coast Univ., Fort Myers, FL 33965 (corresponding author).
2. Deceased March 17, 2011; formerly, Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Colorado State Univ., Fort Collins, CO 80523.
3. Professor, Dept. of Civil and Environmental Engineering, Colorado State Univ., Fort Collins, CO 80523.