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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/52250

    Title: 有限尺寸與荷重傳遞效應對剛性鋪面回算之影響
    Other Titles: Effects of slab size and load transfer efficiency on rigid pavement backcalculation
    Authors: 李彥志;Lee, Yen-chin
    Contributors: 淡江大學土木工程學系碩士班
    李英豪;Lee, Ying-haur
    Keywords: 剛性鋪面;回算;非破壞性試驗(NDT);有限元素法;荷重傳遞;美國長程鋪面績效(LTPP);Rigid Pavement;backcalculation;nondestructive testing (NDT);finite element method (FEM);Load Transfer;LTPP
    Date: 2010
    Issue Date: 2010-09-23 17:21:40 (UTC+8)
    Abstract: 非破壞試驗(NDT)儀器被廣泛地用來評估既有鋪面之現況,鋪面各層的彈性模數值通常係由面層撓度資料回算而得。因鋪面撓度量測值會因許多因素不同而異,本研究主要目的在探討有限尺寸與荷重傳遞效應對剛性鋪面回算之影響。
    Non-Destructive Testing (NDT) devices have been widely adopted to evaluate existing pavement conditions. The surface deflection data was often used to backcalculate the elastic moduli of pavement layers. Since there existed many factors affecting the deflection measurements, the primary objective of this study was to investigate the effects of finite slab sizes and load transfer efficiency on rigid pavement backcalculation.
    The two-layer backcalculation approach proposed by the AASHTO for the structural evaluation of existing rigid pavements was first investigated. Even though the proposed approach has already provided adjustment factors to account for the effects of finite slab sizes, their applicability to in-service pavement backcalculation problems was yet to be further discussed. The ISLAB2000 finite element (FE) program was adopted to assist in the following analyses. Structure response databases were created through a series of FE factorial runs.
    Theoretical investigation indicated that finite slab sizes and load transfer efficiency did have significant effects on the resulting FE deflections. For longer slab, the maximum deflection is close to the Westergaard infinite slab solution. For shorter slab, the AASHTO’s proposed adjustment for the finite slab size effects is indeed necessary; otherwise the backcalculated layer moduli might be significantly underestimated. Since load transfer efficiency will result in interlocking effects on shorter slabs which can be treated as infinite slabs, no slab size adjustment on backcalculation results is needed.
    Furthermore, the laboratory tested layer moduli were compared with the backcalculated moduli using the Long-Term Pavement Performance (LTPP) database. Relatively high variability between them was observed indicating that further research study is needed to improve the current state-of-the-art backcalculation approach. In addition, it was also found that for practical backcalculation problems of in-service pavements, the slab size adjustment was not necessary for both shorter slabs and longer slabs, perhaps due to the fact that these pavements were interlocked by load transfer effects.
    Appears in Collections:[土木工程學系暨研究所] 學位論文

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