1. Graduate Research Assistant, Lyles School of Civil Engineering, Purdue Univ., 550 Stadium Mall Dr., West Lafayette, IN 47907 (corresponding author).
2. Associate Professor, Dept. of Civil Engineering and Agricultural and Biological Engineering, Purdue Univ., 550 Stadium Mall Dr., West Lafayette, IN 47907.
3. Professor, Dept. of Civil Engineering, Purdue Univ., 550 Stadium Mall Dr., West Lafayette, IN 47907.