台灣地區位處環太平洋火山地震帶，地震頻繁，除了水平向運動之外，垂直向地表運動對結構物內之機械設施及管線震動反應影響顯著，尤其對核電廠等重要結構物而言。過去通常依照建築物耐震設計規範依場址所建議之垂直向對水平向設計譜加速度係數進行設計，但近年因應近斷層地震的研究，發現耐震設計規範不一定保守；且大多數地表運動或地盤反應分析僅著重於探討水平向運動，關於垂直向的分析相當有限。
本研究基於波傳理論，將大震度人造地震視為岩盤輸入，採用地盤反應分析軟體STRATA進行分析，探討將大震度地震視為水平向地震事件下PWR電廠地盤之反應，同時比較地震輸入岩盤分類不同時之差異。接著依照PWR電廠井下實際地震事件量測資料繪製頻率響應函數，同時進行V/H反應譜比的繪製，比較其峰值週期與垂直向頻率響應函數顯著週期的關聯性，並探討V/H反應譜比放大之原因。另外，透過其他場址實測地震事件，進一步與PWR電廠井下分析結果進行比較，觀察在不同地震事件下，V/H反應譜比峰值週期之趨勢。

When an earthquake occurs, in addition to horizontal motion, the vertical ground motion significantly affects the mechanical facilities and pipeline vibrations within engineering structures, particularly for critical structures like nuclear power plants. In the past, vertical-to-horizontal design response spectral acceleration coefficients were typically determined based on seismic design codes for the specific site. However, it has been found in recent years that seismic design codes may not always be conservative. This study is based on wave propagation theory, where high-intensity artificial seismic events are input into the soil response analysis software STRATA to analyze the response of the nuclear power plant site under the assumption of a horizontal earthquake. Next, based on actual measurement data from the underground of the nuclear power plant (PWR), frequency response functions are generated, and the V/H response spectral ratio is plotted. The study compares the peak periods of the V/H response spectral ratio with the significant periods in the vertical frequency response function, exploring the relationship between them and investigating the reasons for the amplification of the V/H response spectral ratio. Additionally, by comparing the results with the analysis of seismic events at other sites, the study examines the trends of peak periods in the V/H response spectral ratio under different earthquake events.

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