1. School of Civil Engineering and Architecture, Xi’an Univ. of Technology, Xi’an, Shaanxi 710048, PR China.
2. Professor, School of Civil Engineering and Architecture, Xi’an Univ. of Technology, Xi’an, Shaanxi 710048, PR China; School of Civil Engineering, Huanghe S&T Univ., Zhengzhou, Henan 450063, PR China (corresponding author).
3. School of Mechanical and Precision Instrument Engineering, Xi’an Univ. of Technology, Xi’an, Shaanxi 710048, PR China.