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中文標題: 樁斷面降伏對p-y曲線之影響分析與分佈塑鉸模式於側向荷載樁非彈性分析適用性之探討
英文標題: Exploring P-y Curves Considering Sectional Flexural Yielding and Applicability of Distributed Plastic Hinge Model to Inelastic A
編號: NCREE-12-016
語言: 中文
編輯:
媒體型式: 紙本
作者:
邱俊翔   林昌良   陳家漢   
中文摘要: 本研究利用模型試驗配合數值分析,探討樁斷面撓曲降伏對側向荷載樁反應及其試驗p-y曲線分析之影響,並檢驗以分佈塑鉸模式模擬側向荷載樁非彈性反應之適用性。模型試驗為一模型鋁樁樁頭受到側向荷載,包含二階段試驗,分別為小位移與大位移荷載試驗,可藉以觀察樁斷面撓曲降伏現象對側向荷載樁樁體受力分佈與樁周土壤反力分佈之影響。第一階段試驗,樁頭側位移小,此時樁體保持彈性;第二階段試驗,樁頭受承受更大之側向位移,此時樁體產生非彈性之撓曲變形。為得到模型樁斷面實際之非線性撓曲特性,本研究亦進行了撓曲試驗求取模型樁斷面之彎矩-曲率關係。比較兩組樁側向荷載試驗結果,發現在樁降伏前,最大彎矩深度因土壤非線性效應,隨樁頭側位移增加而加深;當樁降伏後,最大彎矩深度變化變小,其塑性區隨荷載增加向上與向下擴展。此外,本研究亦發現當分析本試驗資料以求取此模型樁-土系統之土壤p-y曲線時,須採用正確之非線性斷面撓曲性質方可得到合理之p-y曲線。最後,本研究亦利用分佈塑鉸模式來模擬此模型試驗,分析結果顯示分佈塑鉸模式可有效模擬樁降伏後之非彈性反應及其塑性區之發展。
英文摘要: This study uses model pile load testing combined with numerical analysis to investigate the pile response as well as soil reaction, and p-y curve analysis due to the flexural yielding of a pile, and to examine the applicability of the distributed plastic hinge model to simulate the inelastic pile response. Two successive lateral load tests on an aluminum model pile in sand were conducted for this study. In the first test, the pile was subjected to a small lateral pile-head displacement, a displacement under which the pile remained elastic. In the second test, the pile was loaded to a much larger lateral pile-head displacement, a displacement under which some of the pile sections yielded and thus the pile had inelastic flexural deformation. Comparison of the results of both tests shows that before the pile yielded, the depth of maximum moment increased with increasing load due to soil nonlinearity; after the pile yielded, the depth of maximum moment varied less and the plastic region expanded upward and downward around this depth with increasing pile displacement. In developing the p-y responses for the pile-soil system, a correct nonlinear flexural rigidity of the pile section is essential to retrieve rational ones. In addition, the distributed plastic hinge model is shown to be effective to model the inelastic pile response and capture the development of plastic zones in the pile.
關鍵字: 樁、側向載重、模型試驗、砂土
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