1. School of Civil Engineering and Environmental Science, Univ. of Oklahoma, Norman, OK 73019. E-mail: noman@ou.edu
2. Professor, School of Civil Engineering and Environmental Science, Univ. of Oklahoma, Norman, OK 73019. E-mail: zaman@ou.edu
3. Associate Professor, School of Civil Engineering and Environmental Science, Univ. of Oklahoma, Norman, OK 73019. E-mail: kolar@ou.edu