1. School of Civil Engineering, Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin 150090, China, caozelin1990@163.comtaoxiaxin@aliyun.comtangap@hit.edu.cn
2. Also at Institute of Engineering Mechanics, China Earthquake Administration, 29 Xuefu Road, Nangang District, Harbin 150080, China.
3. Institute of Engineering Mechanics, China Earthquake Administration, 29 Xuefu Road, Nangang District, Harbin 150080, China, taozr@iem.ac.cn