1. Associate Professor, Dept. of Civil and Environment, Tennessee Technological Univ., 1020 Stadium Dr., Prescott Hall 216, Cookeville, TN 38505 (corresponding author). E-mail: xhuo@tntech.edu
2. Graduate Research Assistant, Dept. of Civil and Environment, Tennessee Technological Univ., 1020 Stadium Dr., Prescott Hall 216, Cookeville, TN 38505. E-mail: qzhang22@tntech.edu