1. Lecturer, School of Civil Engineering, Tangshan Univ., No. 38, Huayan Rd., Tangshan, Hebei 063000, China (corresponding author).
2. Professor, School of Architecture and Construction, Xi’an Univ. of Architecture and Technology, Xi’an, Shanxi 710055, China.
3. Lecturer, School of Civil Engineering, Tangshan Univ., Tangshan, Hebei 063000, China.