1. Associate Professor, Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Dept. of Civil Engineering, Tsinghua Univ., Beijing 100084, China (corresponding author).
2. Postdoctoral Fellow, Dept. of Civil Engineering, Tsinghua Univ., Beijing 100084, China.
3. Graduate Student, Dept. of Civil Engineering, Tsinghua Univ., Beijing 100084, China.