1. Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China, duke@iem.ac.cnjingjiangsun@sina.cn
2. Key Laboratory of Underground Engineering Technology, Harbin University, Harbin 150080, China, dinging04551@126.com
3. Zachry Department of Civil Engineering, Texas A&M University, College Station 77843, Texas, hluo@tamu.edu