Zhang Y.,Guangzhou University |
Zhang Y.,Transportation Institute |
Zhang Y.,Guangxi Key Laboratory of Disaster Prevention and Structural Safety |
Tan P.,Guangzhou University |
And 2 more authors.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2015
Time-history analysis method is the most popular seismic analysis one of bridge structures, however, selection of input seismic motion is a key factor to affect the reliability of time-history analysis results. Combining the basic principle of structure dynamic amplification coefficient and the energy principle of seismic wave. The seismic response spectrum of a bridge structure was divided into two intervals, one was a lower-frequency interval with a frequency range of ±30% the structure's natural vibration period, the other was a higher-frequency one with a frequency range of 0.1 s -Tg regulated by the code. The surrounding areas fo these two intervals' spectral curves were taken as comparative parameters to choose natural seismic wave records. Five adjusting methods of natural seismic wave records based on the above mentioned two intervals were presented here. In addition, seismic response numerical analysis of a typical multi-span bridge was performed, bridge pier bottom moment, base shear and pier top displacement were taken as statistical values of the bridge's seismic responses. Numerical analysis results showed that the double-parameter selecting and adjusting methods for seismic wave records are reasonable and effective. ©, 2015, Chinese Vibration Engineering Society. All right reserved.