土壤液化為伴隨地震所發生之一種現象，土壤液化當下對地表振動的影響較少被討輪，本研究嘗試從土壤液化發生時之地震分析之觀點切入，藉由比較有土壤液化現象之場址地震測站資料與一般測站資料，觀察土壤液化對於地表振動之影響，並討論其可能對建築結構物與非結構物之影響。
2011 年日本發生規模9.0 東北地震，造成日本東北部東北( Tohoku )地區與關東( Kanto )地區發生大範圍的土壤液化，本研究以地震時位於土壤液化場址之K-net 強震測站資料為研究對象，做MIF(t)、傅立葉頻譜、地表最大加速度以及地表最大位移分析，觀察土壤液化發生時對於地震所造成之影響與特性，並與同年紐西蘭Christchurch 地震近震央液化場址資料作比較，歸納出土壤液化場址之振動特性。
本研究進一步討論土壤液化場址振動對建築物之影響，以東北地震時土壤液化場址之振動資料之反應譜討論不同單自由度系統對土壤液化場址之振動之反應。另外以東北地震時位於或鄰近土壤液化場址之BRI 建築物測站記錄資料做頂層加速度放大倍率與頂層相對位移分析，觀察建築物受土壤液化場址振動之實際反應。
研究結果顯示，土壤液化會使地表振動頻率往低頻偏移，水平向振動頻率有集中之現象。而在近震央之液化場址，地表振動水平向加速度相較於無液化場址有明顯的衰退，垂直向加速度則比無液化場址高，故有V/H ratio 高於一般場址的現象。而土壤液化造成的低頻振動，可能對建築物中的非結構物造成影響，並且對於較高樓層建築物之加速度與位移反應有較顯著的影響。

Liquefaction as a phenomenon arise simultaneously with earthquake, this study focus on the influence of liquefaction on ground motion characteristic and the effect on buildings. On 11th March 2011, a devastating earthquake of moment magnitude Mw 9.0 struck the Tohoku and Kanto regions of Japan and caused severe liquefaction in these
region. In this study, the Tohoku earthquake data recorded from both liquefaction site and non-liquefaction site were analyzed and compared to study the ground motion characteristics of liquefaction site.
Besides, further study about the effect of the ground motion characteristics of liquefaction site on buildings were discussed with response spectra of records from
liquefaction site. Records of Tohoku earthquake from the BRI (Building Research Institute) building strong motion stations near or on the liquefaction site were analyzed
to study the real respond of the buildings.

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