1. Graduate Research Assistant, Dept. of Civil, Architectural, and Environmental Engineering, Missouri Univ. of Science and Technology, 1401 N. Pine St., Rolla, MO 65409-0030.
2. Associate Professor, Dept. of Civil, Architectural, and Environmental Engineering, Missouri Univ. of Science and Technology, 1401 N. Pine St., Rolla, MO 65409-0030 (corresponding author).