1. College of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China;
2. State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, China
3. Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing 100044, China
4. State Key Lab for Strength and Vibration of Mechanical Structures, Department of Engineering Mechanics, Xi'an Jiaotong University, Xi'an 710049, China
5. College of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China e-mail:
6. State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, China e-mail: