1. Assistant Professor, Dept. of Civil and Environmental Engineering, South Dakota State Univ., Brookings, SD 57007; formerly, Postdoctoral Scholar, Dept. of Civil and Environmental Engineering, Univ. of Nevada, Reno, NV 89557 (corresponding author).
2. Professor, Dept. of Civil and Environmental Engineering, Univ. of Nevada, Reno, NV 89557.