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选择合适的地震动强度参数可降低与结构响应相关分析结果的离散性,为得到较为合适的描述Kiewitt-8型单层球面网壳地震响应的地震动强度参数,对常用地震动强度参数的考虑因素进行分析,按是否考虑结构动力特性将其分为地震动绝对强度和地震动相对强度(基本模态的加速度反应谱值)Sa(T1);对Kiewitt-8型单层球面网壳分别进行大量的水平一维和竖向一维地震时程响应分析,计算地震动强度参数与结构响应的相关系数。结果表明:地震动相对强度参数在水平方向上与地震动绝对强度参数相比能较好反映地震作用对结构的影响,但在竖向存在局限,与结构响应不具有较好的相关性。此外,控制结构最大竖向响应振动模态的振动周期通常是未知的。通过对Sa(T1)局限产生的原因进行分析,提出了一种可用于工程的地震动相对强度参数即敏感频率反应谱值Sa(fp),该参数在水平向和竖向表现出了更好的与结构响应的相关性。
In order to get a more suitable ground motion strength parameter to describe the seismic response of Kiewitt-8 single-layer reticulated dome, the selection of appropriate parameters of ground motion strength can reduce the discreteness of analysis results related to structural response. According to the structural dynamic characteristics, Sa (T1) is divided into the absolute intensity of ground motion and the relative intensity of ground motion (acceleration response spectra of the basic modal), and the Kiewitt-8 single- A large number of horizontal one-dimensional and vertical one-dimensional seismic time history response analysis, the correlation coefficient of seismic intensity parameters and structural response is calculated. The results show that the relative intensity parameters of ground motion can better reflect the effect of seismicity on the structure in the horizontal direction than the absolute strength parameters of ground motion, but there are some limitations in the vertical direction and have no good correlation with the structural response. In addition, the maximum vertical vibration mode of the control structure vibration period is usually unknown. By analyzing the causes of the limitation of Sa (T1), a sensitive frequency response spectrum Sa (fp), which is a relative intensity parameter of ground motion that can be used in engineering, is proposed. This parameter shows a better horizontal and vertical response Correlation with structural response.