1. Associate Professor, Kansas State Univ., 2118 Fiedler Hall, Manhattan, KS 66506 (corresponding author).
2. Senior Engineer, CTL Group, 3737 Executive Center Dr. Suite 255, Austin, TX 78731.
3. Professor, Auburn Univ., 238 Harbert Engineering Center, Auburn, AL 36849.
4. Associate Professor, Univ. of Texas at Austin, Civil, Architectural and Environmental Engineering Dept.-STR, 301 E. Dean Keeton St. Stop C1748, Austin, TX 78712.
5. Professor, Univ. of Texas at Austin, Civil, Architectural and Environmental Engineering Dept.-STR, 301 E. Dean Keeton St. Stop C1748, Austin, TX 78712.