弹性SDOF系统的地震输入能量谱

本文以4种场地土条件下40条强震记录为输入,对弹性单自由度(SDOF)系统的地震输入能量谱进行了研究。首先研究了SDOF系统参数和地面运动参数对弹性地震输入能量谱的影响。结果表明,在中长周期范围,弹性SDOF系统的阻尼比和地面运动强度对能量谱峰值有较大影响;在长周期范围,随弹性SDOF系统阻尼比的增大,能量谱值也有所增大。随后,采用归一化能量谱方法,并根据能量谱曲线的特征,建议了简化三段式地震输入能量谱。在此基础上,根据4种场地土条件下40条强震记录能量谱计算结果的统计分析,建议了能量谱峰值和能量谱曲线参数的确定方法。

Earthquake Input Energy Spectra of Elastic SDOF Systems

The earthquake input energy spectrum of elastic single degree of freedom(SDOF) system under a world-wide ensemble of 40 earthquake records of different site types are studied.The influence parameters,including the parameters of the SDOF systems and the ground motions,on the input energy spectrum are investigated.The results indicate that the peak value the input energy spectrum mainly depends on the intensity of ground motion and the damping ratio of SDOF system.For the flexible SDOF systems,the input energy spectrum increases with damping ratio.With the normalized input energy spectrum method,the input energy spectrum is simplified into three parts as a function of the vibration period of the SDOF systems.Finally,based on the statistical analysis of the normalized,the factors of the input energy spectrum are suggested.