1. Ph.D. Student, School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical Univ., Xi’an 710100, China.
2. Master’s Degree Candidate, School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical Univ., Xi’an 710100, China.
3. School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical Univ., Xi’an 710100, China (corresponding author).
4. Associate Professor, School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical Univ., Xi’an 710100, China.
5. Professor, School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical Univ., Xi’an 710100, China.