1. Graduate Student, Zachry Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-3136.
2. Assistant Professor, Zachry Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-3136 (corresponding author). E-mail: pgardoni@civil.tamu.edu
3. Professor and Holder of the Buchanan Chair, Zachry Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-3136.