1. Assistant Professor, Dept. of Construction Management and Civil Engineering Technology, Georgia Southern Univ., Statesboro, GA 30460-4085 (corresponding author). E-mail:jshen@georgiasouthern.edu
2. Professor, Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634-0911. E-mail: kcdoc@clemson.edu
3. Volkert & Associates, Inc., 3809 Moffett Rd., Mobile, AL 36618. E-mail: aune_21@hotmail.com