School of Civil Engineering/Key Laboratory of Coast Civil Structure Safety,Ministry of Education(Tianjin University),Tianjin 300072,China;
Ren’ai College,Tianjin University,Tianjin 301636,China;
Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration(Tianjin University),Tianjin 300350,China;
Key Laboratory of Engineering and Structural Retrofi t,Beijing University of Technology,Beijing 100124,China;
Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;
pulse-like ground motion; velocity pulse; relative energy zero-crossing ratio; short-time input energy; shorttime zero crossing rate;