台灣位於環太平洋地震帶，沿海結構物在設計上多採用深基礎設計，而沿海地質常見為易於觸發液化條件之疏鬆軟弱的沖積土層，受震後易產生土壤液化現象。而從過去地震觀測紀錄顯示，臨近斷層破裂帶附近所觀測到的地表震動特徵，具有短時間內地表單方向大幅位移及高速度脈衝，單方向高能量震波會造成結構物不易藉由擺動來有效消散能量，而高頻能量之地震訊號也會增加不同週期結構物非彈性之耐震需求。為釐清不同地震波形特徵於短期不排水情況時樁土互制行為與超額孔隙水壓之交互作用，本研究利用國家地震工程研究中心台南實驗室之振動台及小尺寸單向層狀剪力盒，進行單樁之樁土互制物理模型實驗，分析樁身應變計及土壤中微型水壓計、微型加速度規之量測資料，探討土壤受震反應及樁土互制行為。本研究針對具近斷層特徵之地震歷時進行振動台試驗，基樁受震反應引用樑理論，利用樁身應變計量測求得彎矩，以最小平方法並考慮配置與量測之邊界條件對樁身彎矩進行擬合，得出樁身彎矩分佈函數，並對此函數進行兩次微分與兩次積分得到土壤反力及基樁側向位移，以探討液化前與液化後之p-y曲線變化、土壤液化觸發行為、不同上部載重所產生之慣性力，及不同波形頻率對不同波型頻率之地震對於樁土互制行為之影響。

Taiwan is located in Circum-Pacific Seismic Belt, and the foundations of coastal structures are installed is mostly composed of saturated sandy soil, which is liquefiable during earthquakes. From the experience of seismic observations, the characteristics of the ground motion observed the near fault area are often manifested in a large displacement and a incremental velocity in a short period of time. To investigate the pile-soil interaction of earthquake motions at different levels of liquefaction, results of shaking table tests included physical modeling of pile-soil interactions, which were performed using Multi-Axial Simulation Table and small-scale laminar shear box of National Center for Earthquake Engineering. In order to exhibit the variation of dynamic behavior of pile and soil during excitation, the data of strain gauges placed on the pile surface and the piezometers and mini-accelerometers in the soil which can be used to monitor pore water pressure were analyzed. On the basis of Winkler beam theory, the bending moment can be obtained through the strain gauges on the pile. The distribution function of the bending moment curve of the pile body in the form of polynomials was obtained by the least square method and by setting proper boundary conditions. During the analysis, soil resistance(p) can be obtained by twice differentiating the bending moment curve, whereas the pile deflection(y) involves twice integrating the moment curves. Thus, the p-y curve of the soil before and after liquefaction can be obtained. According to analyses of the dynamic responses of the physical modeling, to investigate the triggering behavior of sand liquefaction, the inertial force generated by different structure loading and the pile-soil interactions in different earthquakes.

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