1. Associate Professor, School of Civil and Transportation Engineering, Guangdong Univ. of Technology, Guangzhou, Guangdong 510006, China.
2. Postgraduate Student, School of Civil and Transportation Engineering, Guangdong Univ. of Technology, Guangzhou, Guangdong 510006, China.
3. Senior Engineer, Dept. of Bridge Engineering, Hunan Provincial Communications Planning, Survey & Design Institute Co., LTD., Moon Island St., Wangcheng District, Changsha, Hunan 410082, China.
4. Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Irvine, CA 92697 (corresponding author).