1. Associate Professor, State Key Laboratory of Subtropical Architecture Science, South China Univ. of Technology, Guangzhou 510640, P.R. China.
2. Professor, Dept. of Civil and Environmental Engineering, Michigan State Univ., East Lansing, MI 48824 (corresponding author).
3. Professor, State Key Laboratory of Subtropical Architecture Science, South China Univ. of Technology, Guangzhou 510640, P.R. China.
4. Graduate Student, Dept. of Civil Engineering, South China Univ. of Technology, Guangzhou 510640, P.R. China.