中文摘要：

现有抗震设计理论大多是基于承载力或强度的设计方法,与其相应的反应谱理论的最大缺陷是无法反映地震持时的影响,以地震能量作为设计参数的抗震设计理论则有望弥补这一不足。该文在地震瞬时输入能量概念的基础上,利用统计学原理对结构的反应持时提出一种新的定义,用以描述地震波对结构的持时效应,并通过建立相应的持时谱来研究结构动力参数以及地震波特征参数的变化对该持时效应的影响。研究表明：结构阻尼比的增大将使瞬时输入能持时谱的曲线更加平滑,地震波加速度幅值的变化对谱值没有影响,而随着地震波峰值速度与峰值加速度比值的增加,谱值趋于增加。通过总结100条地震波瞬时输入能持时谱曲线的变化规律,提出了阻尼比为5%时的线性单自由度体系瞬时输入能持时谱的简化计算模型,该模型的获得将为结构能量输入历程的预估以及以其为基础的结构损伤历程研究提供必要的基础。

英文摘要：

Most of current methods in the aseismic design of structures require the provision of sufficient strength against anticipated seismic effects.The corresponding design response spectra can not reflect the effect of the time duration of an earthquake.The energy based aseismic design is known as an alternative design methodology.A parameter study is carried out on input the duration of the structural energy response based on the momentary input energy and statistical theory,which can reflect the effects of the duration on structures.By establishing the duration of momenary input energy spectra of a linear single degree of freedom（SDOF） system,the effects of the structural dynamic parameters and the characteristics of seismic on the duration were observed.It is found that peak value of the duration of momentary input energy spectrum decreases obviously with damping ratio increase and the changing of peak ground acceleration do not have effects on the duration of momentary input energy spectrum.Based on a total of 100 ground motion records from many significant earthquakes with different peak ground velocities to acceleration（V/A）,two parts simple function is suggested according to the shapes of spectra.A simplified model is developed for calculating the duration of momentary input energy spectra to the linear SDOF system with 5% damping.This research conclusion provided a theoretical foundation for more research of the quantization to the cumulative damage in time process based on input energy time histories.