1. Formerly, Research Assistant, Dept. of Civil and Environmental Engineering, Louisiana State Univ., Baton Rouge, LA 70803.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803. E-mail: cscai@lsu.edu
3. Assistant Professor, Dept. of Civil and Environmental Engineering, Colorado State Univ., Fort Collins, CO 80523. E-mail: suren.chen@colostate.edu