1. School of Civil Engineering and Architecture, Southwest Univ. of Science and Technology, Mianyang, China.
2. Professor, School of Civil Engineering and Architecture, Southwest Univ. of Science and Technology, Mianyang, China (corresponding author).
3. School of Information Engineering, Southwest Univ. of Science and Technology, Mianyang, China.
4. Professor, School of Information Engineering, Southwest Univ. of Science and Technology, Mianyang, China.