1. Lecturer, College of Civil Engineering, Xi’an Univ. of Architecture and Technology, Xi’an, Shaanxi 710064, China.
2. Professor, Highway College, Chang’an Univ., Xi’an, Shaanxi 710064, China (corresponding author).
3. Professor, Key Laboratory of Concrete and Prestressed Concrete Structures, Ministry of Education, Southeast Univ., Nanjing, Jiangsu 210096, China.
4. Lecturer, Highway College, Chang’an Univ., Xi’an, Shaanxi 710064, China.