1. Ph.D. Candidate, Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Dept. of Civil Engineering, Tsinghua Univ., Beijing 100084, China.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA 24061.
3. Assistant Professor, Dept. of Civil Engineering, Beijing Engineering Research Center of Steel and Concrete Composite Structures, Tsinghua Univ., Beijing 100084, China (corresponding author).
4. Professor, Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Dept. of Civil Engineering, Tsinghua Univ., Beijing 100084, China.