1. Professor, Dept. of Civil Engineering, Univ. of Colorado Denver, 1200 Larimer St., P.O. Box 173364, Denver, CO 80217 (corresponding author).
2. Assistant Professor, Beijing Advanced Innovative Center for Future Urban Design, Beijing Univ. of Civil Engineering and Architecture, Beijing 100044, China.
3. Professor, Beijing Advanced Innovative Center for Future Urban Design, Beijing Univ. of Civil Engineering and Architecture, Beijing 100044, China.