1. Senior Engineer and Group Manager, CTL Group, Austin, TX 75759.
2. Assistant Professor, Dept. of Civil Engineering, Kansas State Univ., Manhattan, KS 66506.
3. Associate Professor, Dept. of Civil, Architectural, and Environmental Engineering, The Univ. of Texas at Austin, Austin, TX 78712 (corresponding author).
4. Professor, Dept. of Civil, Architectural, and Environmental Engineering, The Univ. of Texas at Austin, Austin, TX 78712.
5. Associate Professor, Dept. of Civil Engineering, Auburn Univ., Auburn, AL 36849.