1. Ph.D. Candidate, Dept. of Construction and Real Estate, School of Civil Engineering, Southeast Univ., No. 2 Sipailou of Xuanwu District, Nanjing, P.R. China (corresponding author).
2. Professor, Dept. of Construction and Real Estate, School of Civil Engineering, Southeast Univ., No. 2 Sipailou of Xuanwu District, Nanjing, P.R. China.
3. Lecturer, Dept. of Construction and Real Estate, School of Civil Engineering, Southeast Univ., No. 2 Sipailou of Xuanwu District, Nanjing, P.R. China.