1. Lecturer, School of Civil Engineering and Built Environment, Queensland Univ. of Technology, 2 George St., Brisbane, QLD 4001, Australia; formerly, Postdoctoral Research Fellow, Dept. of Civil, Architectural, and Environmental Engineering, Univ. of Texas at Austin, 1 University Station, Austin, TX 78712.
2. Associate Professor, Dept. of Civil, Architectural, and Environmental Engineering, Univ. of Texas at Austin, 1 University Station, Austin, TX 78712 (corresponding author). E-mail: caldas@mail.utexas.edu