1. Lecturer, School of Civil Engineering, Qingdao Univ. of Technology, Qingdao 266033, China.
2. Postgraduate Student, School of Civil Engineering, Qingdao Univ. of Technology, Qingdao 266033, China.
3. Professor, School of Civil Engineering, Chongqing Univ., Chongqing 400044, China; Alexander von Humboldt Research Fellow, Institute of Steel, Lightweight and Composite Structures, Dept. of Civil and Environmental Engineering, Ruhr-Universität Bochum, Universitätstraße 150, D-44801 Bochum, Germany (corresponding author).
4. Professor, Dept. of Civil Engineering, California State Polytechnic Univ., Pomona, CA 91768.