間接土壓力模式應用於側潰影響之樁基波動方程分析

徐守亨

doi:10.6846/TKU.2009.00212

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間接土壓力模式應用於側潰影響之樁基波動方程分析

Study on Lateral Spreading Affected Piles Using Indirect Earth Pressure Model and Wave Equation Analysis

徐守亨 , Masters　　Advisor：張德文　　

繁體中文 DOI： 10.6846/TKU.2009.00212

側潰；地盤變位；波動方程；樁基礎； lateral spreadiong ； ground displacement ； wave equation ； pile foundtion

Abstract │ Reference (150) │ Times Cited (5) │ Altmetrics

Abstract 〈TOP〉

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The indirect earth pressure model with one dimensional wave equation analyses is used to simulate the seismic responses of a single pile affected by soil lateral spreading. With the field investigation, the permanent ground displacement can be estimated according to the method proposed by Tokimatsu（2003）. The permanent ground displacement multiplied by the normalized seismic displacement function is regarded as the seismic responses of the ground displacement. Finally, the dynamic ground displacement profile is applied to the pile elements through the soil springs , and the pile non-linearity is simulated by the simplified Bouc-Wen Model. Thus the deformations and failure mechanism of the pile are able to be understood. This analysis is also validated by the parameter studies and the case studies of pile failure due to earthquake in Japan.
　　The results of this study are concluded as follows:（1）For the underlying non-liquefied layer, the soil springs are used to simulated its non-linearity. （2）The pile non-linear behavior is characterized by the simplified Bouc-Wen Model where α and z are back calculated from the tri-linear moment-curvature relationship. （3）From the parameter studies: It can be found that the five parameters of the Permanent Model all influence the analyses. However , the simulation of the factor, zw is not as fine as others. Compared with the thickness of the liquefied layer, if the length of the pile is not long enough, the displacement of the pile tip will be not so closer to zero. The pile response is smaller when the stiffness reduction coefficient, β, is applied. （4）The largest pile displacement would occurs at the pile head. The values of the moments at the pile head or the interface between the liquefied layer and the underlying non-liquefied layer may exceed the ultimate moment. So the two section of a pile is in need of strengthening to ensure the safety of the superstructure. （5）The frame of this study is based on the Earthquake Wave Equation Analysis of Pile（for short: EQWEAP）. The pre-solution involved is the ground displacement profile, and it also can be the direct earth pressure profile. （6）Compared with the direct earth pressure model ,the responses of  this study are smaller. （7）The indirect earth pressure model is relatively simple, and the instant responses at different times are able to be caught easily.

Reference ( 150 ) 〈TOP〉

1. Abdoun, T. and Dobry, R. (2002), “Evaluation of Pile Foundation Response to Lateral Spreading,” Soil Dynamics and Earthquake Engineering, Vol. 22, pp.1051-1058.
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2. ACI Committee 318 (1995), “Building Code Requirements for Structural Concrete (ACI 318-95) and Commentary (ACI 318R-95),” American Concrete Institute.
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3. Ambraseys, N.N. (1988), “Engineering Seismology,” earthquake engineering and structural dynamics, Vol. 17, pp.1-105.
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4. API (1993), “Recommended Practice for Planning, Design, and Constructing Fixed Offshore Platforms,” API RP 2A-WSD, 20th ed., American Petroleum Institute.
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6. Bartlett, S.F., and Youd, T.L. (1995), “Empirical Prediction of Liquefaction-Induced Lateral Spread,” Journal of Geotechnical Engineering, ASCE, Vol. 121, No. 4, pp. 316-329.
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Times Cited (5) 〈TOP〉

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