1. Professor, Dept. of Civil Engineering, Key Laboratory of Structural Engineering and Vibration of China Education Ministry, Tsinghua Univ., Beijing 100084, China.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ., Baton Rouge, LA 70803.
3. Formerly, Graduate Student, Dept. of Civil Engineering, Tsinghua Univ., Beijing 100084, China.
4. Senior Engineer, Shenzhen Design Institute of Municipal Engineering, Shenzhen 518028, China.