1. Research Specialist, Dept. of Civil, Environmental and Geodetic Engineering, Ohio State Univ., 2070 Neil Ave., 311 Hitchcock Hall, Columbus, OH 43210 (corresponding author).
2. Research Associate, Environmental and Architectural Engineering, Univ. of Colorado, 1ECOT Engineering Office Tower, 1111 Engineering Dr., Boulder, CO 80309.
3. Professor, Civil, Environmental, and Architectural Engineering, Univ. of Colorado, UCB 428, Boulder, CO 80309.