硬岩高频谱多点非一致性运动研究

Research of Incoherence Effect on Hard Rock High Frequency Spectrum

美国中东部地区在基岩厂址上的高频谱无法被RG1．60修正谱所包络。这种硬岩高频谱会在15Hz以后超越设计谱，并在30Hz附近达到峰值。结构的高频反应会对安全相关的设备产生较大的影响．本文采用多点非一致性运动的分析方法，研究多点非一致性运动对硬岩高频谱作用下结构反应的影响．通过研究发现：考虑多点非一致性运动对于结构高频部分的反应有明显的降低作用。

Many of the envelope response spectra of the Central and Eastern United States rock sites show higher amplitude at higher frequency than RG1.60 based design spectra. The high frequency spec- trum exceeds the RG1.60 spectrum for frequencies above about 15 Hz and reaches peak at 30Hz. Such high frequency motions have large effect on the safety function of equipment. The incoherence effect is in- troduced to research of the response under hard rock high frequency spectrum. According to the research, considering of the wave incoherence effect will reduce the in-structure response on high frequency.