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基于由随机振动理论得到的功率谱密度与加速度反应谱之间的关系,以及由傅里叶幅值谱精确计算输入能量反应谱方法,提出了建立与设计加速度反应谱匹配的输入能量谱方法。计算了与《建筑抗震设计规范》(GB50011-2010)设计反应谱匹配的输入能量谱,通过与实际强震记录输入能量谱特征对比,对设计反应谱长周期段输入能量特征进行了分析。结果表明,由于规范设计谱长周期段取值比较保守,在长周期段输入能量随着周期变长逐渐增加,与实际地震动记录输入能量谱长周期特征明显不同。根据实际强震记录输入能量谱特征,给出了设计反应谱长周期直线下降段的取值建议。
Based on the relationship between the power spectral density and the acceleration response spectrum obtained from the random vibration theory and the method of accurately calculating the input energy response spectrum from the Fourier amplitude spectrum, a method of input energy spectrum matching with the designed acceleration response spectrum is proposed. The input energy spectrum matched with the design response spectrum of the Code for Design of Seismic Design of Buildings (GB50011-2010) was calculated. The input energy characteristics of long period of design response spectrum were analyzed by comparing with the energy spectrum characteristics of actual strong earthquake records. The results show that due to the conservative conservative values of the long period of the canonical design spectrum, the input energy gradually increases with the period in the long period, which is obviously different from the long period characteristics of the energy spectrum of the actual record. According to the input energy spectrum characteristics of the actual strong earthquake records, some suggestions on the value of the straight-line descending section of the long period of the response spectrum are given.