1. School of Highway, Chang’an University, 126 South Erhuan Middle Section, Xi’an 710064, China, https://orcid.org/0000-0002-3736-6490 (B.Z.)
2. School of Highway, Chang’an University, 126 South Erhuan Middle Section, Xi’an 710064, China (Corresponding author), e-mail: longjiachu@chd.edu.cn, https://orcid.org/0000-0002-3069-0853
3. Department of Civil Engineering, National University of Singapore, 21 Lower Kent Ridge Rd., Singapore 119077