1. Professor, Structural Engineering Institute, Dalian Univ. of Technology, Dalian, 116024, Liaoning, P. R. China.
2. Student, Structural Engineering Institute, Dalian Univ. of Technology, Dalian, 116024, Liaoning, P. R. China (corresponding author).
3. Student, Structural Engineering Institute, Dalian Univ. of Technology, Dalian, 116024, Liaoning, P. R. China.