1. Department of Engineering MechanicsSchool of Civil EngineeringWuhan UniversityWuhan430072People's Republic of China
2. International Center for Applied MechanicsState Key Laboratory for Strength and Vibration of Mechanical StructuresXi'an Jiaotong UniversityXi'an710049People's Republic of China
3. Department of Civil EngineeringNorth China University of TechnologyBeijing100144People's Republic of China