1. Professor, School of Civil Engineering and Mechanics, Huazhong Univ. of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei 430074, China (corresponding author).
2. Formerly Graduate Student, Dept. of Civil Engineering, City College of New York/CUNY, 160 Convent Avenue, New York, NY 10031.
3. Professor, Dept. of Civil Engineering, City College of New York/CUNY, 160 Convent Avenue, New York, NY 10031.
4. Structural Engineer, Ammann and Whitney, P. C., 96 Morton St., New York, NY 10014.