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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。
Based on 30 sets of near-field seismograms, the effect of vertical seismicity on horizontal and vertical response spectra of near-field earthquakes is studied. The statistical analysis shows that the maximum value of the vertical acceleration mean spectrum of the selected 30 groups of near-field seismic records is slightly higher than the maximum value of the horizontal mean spectrum, indicating that the near-field earthquakes indeed have a significantly higher vertical effect than the far-field earthquakes. Reference to the existing research results at home and abroad, combined with China’s seismic code to establish a corresponding near-field standardized design spectrum. The research shows that after considering the near-field effect, the spectral value of the normalized design spectrum in the horizontal direction increases greatly in a short period, which deserves the attention of researchers in seismic engineering.