1. Graduate Student, Dept. of Civil and Environmental Engineering, Rice Univ., Houston, TX 77005 (corresponding author).
2. Graduate Student, Dept. of Civil and Environmental Engineering, Rice Univ., Houston, TX 77005.
3. Undergraduate Student, Dept. of Civil and Environmental Engineering, Rice Univ., Houston, TX 77005.
4. Assistant Professor, Dept. of Civil Engineering, Univ. of Texas at Arlington, P.O. Box 19308, 416 Yates St., Arlington, TX 76019.
5. Professor, Dept. of Civil and Environmental Engineering, Rice Univ., 6100 Main St. MS-317, Houston, TX 77005.