1. Ph.D. Candidate, College of Highway, Chang’an Univ., Xi’an 710064, PR China.
2. Professor, College of Highway, Chang’an Univ., Xi’an 710064, PR China (corresponding author).
3. Master’s Student, College of Highway, Chang’an Univ., Xi’an 710064, PR China.
4. Master’s Student, Condition Guarantee Dept., Daircraft Strength Research Institute of China, Xi’an 710065, PR China.