1. Professor, Dept. of Civil and Environmental Engineering, Arizona State Univ., Tempe, AZ 85287 (corresponding author).
2. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Arizona State Univ., Tempe, AZ 85287.
3. Professor, Emeritus, Dept. of Civil and Environmental Engineering, Arizona State Univ., Tempe, AZ 85287.