1. Postdoctoral Fellow, School of Civil Engineering, Beijing Jiaotong Univ., No. 3, Shangyuancun, Xizhimenwai, Beijing, 100044, P. R. China; and, Professor, School of Civil Engineering, Northeast Forestry Univ., No. 26, Hexing Rd., Xiangfang District, Hargin 150040, P. R. China.
2. Principal Bridge Engineer, URS Corporation, 8181 East Tufts Ave., Denver, CO 80237; formerly, Guest Professor, College of Civil Engineering, Northeast Forestry Univ., 26 Hexing Rd., Xiangfang District, Harbin 150040, P. R. China (corresponding author).
3. Researcher, Harbin Institute of Technology, 92 Xidazhi Rd., Nangang District, Harbin, 150090, P. R. China.