1. Professor, School of Human Settlements and Civil Engineering, Xi’an Jiaotong Univ., Xi’an, Shaanxi 710049, China (corresponding author).
2. School of Human Settlements and Civil Engineering, Xi’an Jiaotong Univ., Xi’an, Shaanxi 710049, China; School of Civil and Traffic Engineering, Henan Univ. of Urban Construction, Pingdingshan, Henan 467000, China.
3. Associate Professor, School of Aerospace, Xi’an Jiaotong Univ., Xi’an, Shaanxi 710049, China.