1. Graduate Research Assistant, Dept. of Civil Engineering, Texas A&M Univ., TAMU 3135, College Station, TX 77843 (corresponding author).
2. Professor, Dept. of Civil Engineering, Texas A&M Univ., TAMU 3135, College Station, TX 77843.
3. Assistant Professor, Dept. of Civil, Architectural, and Environmental Engineering, 1 University Station C1761, The Univ. of Texas at Austin, Austin, TX 78712.