1. Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin, China and Key Laboratory of Earthquake Disaster Mitigation, Ministry of Emergency Management, Harbin, China.
2. Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin, China and Key Laboratory of Earthquake Disaster Mitigation, Ministry of Emergency Management, Harbin, China. (corresponding author)