**Author details**

Xirong Niu Department of Civil Engineering, Shanxi University, Taiyuan, Shanxi, China

\*Address all correspondence to: niuxirong@sxu.edu.cn

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
