1. Associate Professor, School of Civil Engineering, Central South Univ., Changsha, Hunan 410075, PR China.
2. Engineer, Shanghai Construction Group, No. 666 Dongdamming Rd., Shanghai 200080, PR China.
3. Professor, School of Civil Engineering, Central South Univ., Changsha, Hunan 410075, PR China (corresponding author).
4. Professor, School of Civil Engineering, Central South Univ., Changsha, Hunan 410075, PR China.