1. a Department of Civil and Environmental Engineering , University of South Carolina , 300 Main Street, Columbia , SC , 29209 , USA E-mail:
2. b Department of Civil and Environmental Engineering , University of South Carolina , 300 Main Street, Columbia , SC , 29209 , USA
3. c Department of Civil and Environmental Engineering , University of South Carolina , 300 Main Street, Columbia , SC , 29209 , USA E-mail: