1. Graduate Student, Dept. of Civil and Environmental Engineering, Utah State Univ., UT 84322. E-mail: sl22l@cc.usu.edu
2. Associate Professor, Dept. of Civil and Environmental Engineering, Utah State Univ., UT 84322. E-mail: halling@cc.usu.edu
3. Assistant Professor, Dept. of Civil and Environmental Engineering, Utah State Univ., UT 84322. E-mail: pbarr@cc.usu.edu