1. Associate Professor, Dept. of Civil Engineering, Zhejiang Univ. of Technology, Hangzhou 310023, China.
2. Graduate Student, Dept. of Civil Engineering, Zhejiang Univ. of Technology, Hangzhou 310023, China.
3. Assistant Professor, Dept. of Civil Engineering, Nanjing Forestry Univ., Nanjing 210037, China.
4. Professor, Dept. of Civil Engineering, Zhejiang Univ. of Technology, Hangzhou 310023, China (corresponding author).