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在加速度反应谱与峰值速度不变的条件下,研究输入地震动峰值位移对单自由度体系动力反应、尤其是弹塑性动力反应的影响。利用在时域内叠加窄带时程的方法合成加速度反应谱和峰值速度相同而峰值位移相差1倍的两组人工地震动时程,按照GB 50011—2010《建筑抗震设计规范》的要求,将合成的输入地震动采用不同设防烈度多遇地震的峰值加速度标定,进行体系的弹性分析。结果显示,输入地震动峰值位移的变化对弹性动力反应基本无影响。将输入地震动采用相应烈度罕遇地震的峰值加速度标定,并以上述多遇地震作用下弹性最大位移反应作为罕遇地震作用下结构弹塑性分析的屈服位移,进而分析输入地震动峰值位移变化对弹塑性动力反应的影响规律。结果表明:峰值位移的增大将会明显增大中长周期结构弹塑性位移反应和速度反应,这种放大效应对位移反应尤为显著,其规律在不同设防烈度区具有一致性,即随着设防烈度的提高,输入地震动峰值位移的增大引起的大部分中长周期结构弹塑性位移及速度反应的放大效应减小。因此,在进行结构动力分析时,应充分考虑输入地震动峰值位移变化对计算结果的影响。
Under the conditions of constant acceleration response spectrum and peak velocity, the effect of input ground motion peak displacement on the dynamic response of single degree of freedom system, especially the elasto-plastic dynamic response, is investigated. Two sets of artificial ground motion time-history with the same peak velocity but different by 1 time from the peak velocity were synthesized by superposition of narrow-band time-history in the time domain. According to the requirements of GB 50011-2010 Code for Seismic Design of Buildings, The input earthquakes are calibrated using the peak acceleration of the earthquake with different fortification intensity and the system is analyzed flexibly. The results show that the change of peak displacement of input ground motion has almost no effect on the elastic dynamic response. The input earthquakes are calibrated with the peak accelerations of the rare earthquakes with corresponding intensities and the maximum elastic response of the earthquakes is taken as the yield displacement of the structure elastoplastic analysis under the rare earthquakes. Then the change of the peak displacement of the input earthquakes is analyzed Influence laws of elastic-plastic dynamic reaction. The results show that the increase of the peak displacement will obviously increase the elastic-plastic displacement reaction and velocity response of medium-long period structure. The amplification effect is particularly significant for the displacement response. The regularity of the displacement is consistent in different fortification intensity areas, , The elastic-plastic displacement of most medium-long period structures caused by the increase of the peak displacement of input earthquakes and the amplification effect of velocity response decrease. Therefore, when carrying out structural dynamic analysis, the influence of the change of peak displacement of input ground motion on the calculation results should be fully considered.