近场地震水平及竖向反应谱及设计谱

基于30组近场地震记录,研究近场地震竖向效应对水平及竖向反应谱的影响。统计分析表明,所选30组近场地震记录的竖向加速度均值谱最大值略高于水平均值谱最大值,表明近场地震的确具有明显高于远场地震的竖向效应。参考国内、外已有的研究成果,结合我国抗震规范建立了相应的近场规准化设计谱。研究表明,考虑近场效应之后,水平方向规准化设计谱的谱值在较短周期段有较大提高,值得引起地震工程界研究设计人员的重视。

THE NEAR-FIELD SEISMIC VERTICAL AND HORIZONTAL RESPONSE SPECTRA AND DESIGN SPECTRA

Based on 30 sets of acceleration records of near-field earthquake,the influence of vertical effect of near-field earthquake on the vertical and horizontal response spectra displacement demand of structures was studied in detail.Statistical analysis showed that for the selected acceleration records,the maximum value of the vertical mean spectra was higher than that of the horizontal mean spectra.Hence compared to the far-field earthquake,the near-field earthquake really had much higher vertical effect.Consulting the internal and overseas research results,the near-field standard design spectra were established adapting to Chinese seismic code.The results showed that after considering the near-field effect,the value of horizontal standard design spectra increased obviously in short-period,which was worth paying much attention by researchers and designers in the field of earthquake engineering.