| Summary: | 碩士 === 國立中央大學 === 土木工程研究所 === 96 === This study conducted a series of centrifuge model test to discuss the mechanism of the pile subjected to compressive and tensile loadings, and three different slender ratios of piles with the same embedded length were designed in the test. During the test, the model pile was first driven into the dry sand at 1g condition, and then an artificial gravity of 80g was applied in the centrifuge to simulate a full-scale prototype situation. Subsequently, two kinds of loading conditions were performed - monotonic loading and cyclic loading, and the differences of ultimate capacity, skin friction and end-bearing between the pile subjected to compressive and tensile loadings could be observed by measuring the axial force along the pile. From the results, the smaller the slender ratio, the smaller the skin friction ratio of tension to compression, the quantity of which ranges between 85 to 62% at ultimate state of monotonic loading. In cyclic loading test, the skin friction ratio of tension to compression gradually decreased from 52% to 46%. Besides, the pile skin friction in compressive condition is always larger than the one in tensile condition.
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