1. College of Civil Engineering and Architecture, A810 Anzhong Building, Zhejiang University, Hangzhou, 310058, China
2. College of Civil Engineering and Architecture, A511 Anzhong Building, Zhejiang University, Hangzhou, 310058, China
3. College of Civil Engineering and Architecture, A505 Anzhong Building, Zhejiang University, Hangzhou, 310058, China
4. Dept. of Civil and Environmental Engineering, Univ. of Alberta, Edmonton, AB, Canada T6G 2W2