多阻尼反应谱拟合的时域叠加法  

Time-Domain Superposition Method for Fitting Multi-Damping Response Spectra

作　　者：赵凤新[1] 张郁山[2] 

机构地区：[1]中国地震灾害防御中心,北京100029 [2]中国地震局地球物理研究所,北京100081

出　　处：《核动力工程》2008年第3期35-40,共6页Nuclear Power Engineering

基　　金：国家科技支撑计划(2006BAC13B02);中国地震局地震行业科研专项经费(200708003)资助

摘　　要：提出了一种在时域内叠加窄带时程的方法,用于提高设计地震动时程对多阻尼目标反应谱的拟合精度。该方法首先利用传统的在频域内调整Fourier幅值谱的方法,生成以给定单阻尼反应谱为目标的初始加速度时程;然后通过在时域内叠加窄带时程进一步调整此初始加速度时程,以提高其对多阻尼目标反应谱的拟合精度。算例分析结果表明,该方法合成的设计地震动时程具有较高的对多阻尼目标谱的拟合精度。In this paper, a method of superposing narrow-band time history in time domain is proposed, which can be utilized to enhance the fitting precisions of design ground shaking time history to multi-damping target acceleration response spectra. Firstly, the traditional method, which modifies the Fourier amplitude spectrum in frequency domain, is adopted to generate the initial acceleration time history, which satisfies the specified single-damping target response spectrum; and then by superposing narrowband time histories in time domain, the initial acceleration time history is further modulated, to improve its fitting precision to the multi-damping target response spectra. The numerical examples demonstrated that the design ground motions generated by the proposed method possess very high fitting precisions to the multi-damping target spectra.

关 键 词：多阻尼反应谱 拟合 时域叠加 设计地震动 频域 

分 类 号：TU311.3[建筑科学—结构工程] O343.1[理学—固体力学]