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基于力或位移的结构抗震设计方法大多无法反映地震动持时的影响,而能量设计方法则能较好地弥补其不足。按场地类别和强震持时,将302条Northridge地震记录分为15组,对地震记录的峰值进行规一化处理,采用钢筋混凝土退化三线型恢复力模型,对单自由度体系进行弹塑性时程分析,研究场地类别、强震持时、强度屈服水平以及结构周期等因素对滞回耗能的影响。结果表明:在给定地震记录的峰值和屈服强度水平下,结构的滞回耗能依赖于场地条件和强震持时等因素;滞回耗能随强震持时的增加而增大,随场地特征周期的增加而增大。通过非线性回归分析,建立了与峰值加速度、峰值速度、强震持时相对应的简化滞回耗能谱的计算公式。
Most of the structural seismic design methods based on force or displacement can not reflect the impact of the timing of the earthquake, while the energy design method can make up for the deficiencies. According to the type of site and the duration of strong earthquakes, 302 Northridge earthquakes are divided into 15 groups to normalize the peak value of the seismic records. The three-dimensional model of resilience of reinforced concrete is used to simulate the elastic- The impact of hysteresis energy consumption on the time-history analysis, the type of study site, the duration of strong earthquakes, the level of yield strength and the structure period are all discussed. The results show that the hysteretic energy consumption of structures depends on the site conditions and the duration of strong earthquakes under the given peak and yield strength of seismic records. The hysteresis energy dissipation increases with the increase of strong earthquakes, The increase of the period of characteristic of the site increases. Through nonlinear regression analysis, the formulas of simplified hysteretic energy spectra corresponding to peak acceleration, peak velocity and strong earthquake holding time are established.