1. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Florida State Univ., A129, 2525 Pottsdamer St., Tallahassee, FL 32310-6046 (corresponding author).
2. Professor, Dept. of Civil and Environmental Engineering, Florida State Univ., A129, 2525 Pottsdamer St., Tallahassee, FL 32310-6046.