1. Department of Civil Engineering Sichuan University Chengdu 610065 China
2. MOE Key Laboratory of Deep Earth Science and Engineering & Failure Mechanics & Engineering Disaster Prevention and Mitigation, Key Laboratory of Sichuan Province Chengdu 610065 China
3. State Key Laboratory of Hydraulics and Mountain River Engineering Chengdu 610065 China
4. Institute of Structural Diagnosis and Rehabilitation, School of Civil Engineering Dalian University of Technology Dalian 116023 China