(清华大学，北京 100084)
［提要］选择了被认为精度较高或者有关规范中建议的8种等效线性化方法，以4种场地土条件下40条强震记录为输入，通过时程分析方法对各种等效线性化方法计算弹塑性SDOF系统能量谱的精度进行了分析。分析结果表明，现有等效线性化方法的等效周期和等效阻尼比之间存在较大差异，且用于预测弹塑性SDOF系统的能量谱时存在较大误差。根据能量谱分析结果的统计计算，建议了一种新的适用于弹塑性SDOF系统能量谱计算的等效线性化方法。
［关键词］弹塑性SDOF系统；能量谱；等效线性化；时程分析
Estimation of Input Energy Spectra of Inelastic SDOF Systems with Equivalent Linear Method/Cheng Guangyu，Ye Lieping(Tsinghua University, Beijing 100084, China)
Abstract:The precision of eight existing equivalent linearization methods to be used to obtain the input energy spectra is evaluated by time history analysis using 40 earthquake records from different sites. The results indicate that there is a large error in prediction of input energy spectra by the preceding methods. Based on the statistical analysis, a new equivalent linearization method to estimate input energy spectrum is proposed. Numerical results for real ground motions having very different characteristics show that the method gives a reasonable prediction.
Keywords:inelastic SDOF system; input energy spectra; equivalent linearization; time history analysis
*教育部科技创新工程重大项目培育资金资助项目(704003)；广东省地震工程与应用技术重点实验室开放基金资助项目(kzg-007)。