1. Assistant Professor, School of Civil and Transportation Engineering, Guangdong Univ. of Technology, Guangzhou, Guangdong 510006, China.
2. Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Irvine, CA 92697.
3. Professor, College of Civil Engineering, Hunan Univ., Changsha, Hunan 410082, China (corresponding author).
4. Engineer, Broadvision Engineering Consultants, Kunming, Yunnan 650011, China.