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确定弹塑性SDOF体系的输入能量是基于能量的设计方法首先要解决的问题。该文从PEER强震记录数据库选取了188条地震记录并按中国规范进行了分类,采用归一化方法,根据能量谱的特征建议了一种基于复合强度指标的三段式弹性输入能量谱。在此基础上,分析了强度折减系数和阻尼比对能量谱峰值和中长周期段的影响。结果发现:强度折减系数和阻尼比对能量谱峰值的削减作用具有明显的相关性,强度折减系数较大时阻尼比对能量谱峰值的削减作用减弱。根据弹塑性能量谱影响因素的分析统计,通过二次拟合,提出了峰值和中长周期段的修正系数。最后根据研究建议了弹塑性SDOF系统能量谱的确定方法。
Determining the input energy of the elasto-plastic SDOF system is the first problem to be solved based on the energy-based design method. In this paper, 188 seismic records are selected from the database of strong earthquakes recorded by the PEER and classified according to the Chinese standard. A normalized method is adopted to propose a three-stage elastic energy spectrum based on the composite intensity index. Based on this, the influence of strength reduction coefficient and damping ratio on the energy spectrum peak and mid-long period is analyzed. The results show that the strength reduction coefficient and the damping ratio have a significant correlation with the reduction of the energy spectrum peaks. When the strength reduction coefficient is large, the damping effect of the damping ratio on the energy spectrum peak is weakened. According to the analysis and statistics of influencing factors of elastic-plastic energy spectrum, the correction coefficient of peak and medium-long periods is proposed by quadratic fitting. Finally, according to the research, the method of determining the energy spectrum of elastic-plastic SDOF system is proposed.