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. Professor, College of Water Conservancy and Environment Engineering, Zhengzhou Univ., Zhengzhou 450002, China.
3. Ph.D. Student, Dept. of Civil Engineering, Tsinghua Univ., Beijing 100084, China.