1. Lecturer, Dept. of Civil Engineering, Shanghai Univ., 99 Shangda Rd., Shanghai 200444, PR China.
2. Graduate Student, Dept. of Civil Engineering, Shanghai Univ., 99 Shangda Rd., Shanghai 200444, PR China.
3. Professor, Dept. of Civil Engineering, Shanghai Univ., 99 Shangda Rd., Shanghai 200444, PR China (corresponding author).
4. Professor, Dept. of Civil Engineering, Shanghai Univ., 99 Shangda Rd., Shanghai 200444, PR China.
5. Postdoctor, Dept. of Civil Engineering, Shanghai Univ., 99 Shangda Rd., Shanghai 200444, PR China.