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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/34609

    Title: 液化土壤模數折減下樁基動力反應分析
    Other Titles: Analyses for dynamic responses of pile foundations affected by modulus reduction of liquefied soils
    Authors: 巫秀星;Wu, Sho-sing
    Contributors: 淡江大學土木工程學系碩士班
    張德文;Chang, Der-wen
    Keywords: 波動方程分析;樁基;液化;土質折減係數;破壞;Wave equation analysis;pile foundation;liquefaction;soil reduction parameters;failure
    Date: 2005
    Issue Date: 2010-01-11 05:25:53 (UTC+8)
    Abstract: 本研究係以波動方程模擬地盤液化狀態下樁基礎之動態反應,依據現場土層鑽探資料與測站地震紀錄,藉日本相關規範之土壤液化評估法分析其土質折減係數,並將此折減係數施用於土壤模數值,配合集中質塊分析模擬自由場地盤液化反應,再將地盤反應作用於樁之波動方程解,用以說明液化地盤內樁基之變形行為與破壞機制。研究除以員林地區地質構造特性討論相關分析外,並以日本新瀉地震之數項破壞案例驗證本研究之合理性。
    In this study, wave equation is used to model the dynamic responses of the foundation in a liquefied ground due to the earthquake. Based on the bore-hole data and the seismic records, the soil parameter reduction factor can be obtained from the liquefaction potential analysis such as those suggested in the Japanese codes. The reduction factor can be used to reduce the soil stiffness along the pile in the liquefaction zone. Lumped mass analysis is performed to obtain the free-field response of the liquefied ground. The deformations of the ground are then superimposed onto the pile elements for the discrete wave equation analysis. Thus the pile response and the failure mechanism are investigated. Besides the studies on Yuan-Lin County sites with Chi-Chi earthquake record, a number of case studies for 1964 Niigata earthquake are used to validate the proposed procedures.
    The main observations of this study are: (1) The ground displacements at the surface would not be amplified by the soil liquefactions, however the ground and the pile displacements are significantly increased in the zone of liquefaction. (2) With or without the liquefaction, a large earthquake would cause excessive moments and shears for the piles near to the head, in which the pile may fail accordingly. (3) Complex failure mechanism could happen according to the connections between the pile and the cap. Further cautions would be required for the foundation structure near by the interfaces of the liquefied and non-liquefied soil layers. (4) The procedures suggested in this study could predict successfully the pile foundation responses in a liquefied ground. It can be used to model effectively for the failure behavior of the pile foundation due to the soil liquefaction.
    Appears in Collections:[土木工程學系暨研究所] 學位論文

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