1. Associate Professor, School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical Univ., Xi’an 710072, PR China.
2. Master’s Student, School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical Univ., Xi’an 710072, PR China.
3. Associate Professor, School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical Univ., Xi’an 710072, PR China (corresponding author).