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中文標題: 樁基礎沖刷橋梁模型之振動台試驗研究(I)
英文標題: Shaking Table Study on Bridge Model with Scoured Piled Foundation (I)
編號: NCREE-12-025
語言: 中文
編輯:
媒體型式: 紙本
作者:
張國鎮   王修駿   劉光晏   翁作新   陳家漢   陳正興   賴姿妤   周贊翔   
中文摘要: 本研究探討橋梁受複合式災害,因樁基礎沖刷裸露對耐震性能之影響,
使用大型雙軸向剪力試驗盒,進行單柱橋梁樁基礎沖刷裸露之振動台實驗。
實驗試體採用單柱橋梁、單樁基礎與乾性石英砂質土壤。實驗規劃數組不
同基樁裸露長度之組別,以觀察地震作用下樁基礎於裸露前、後對橋體、
基樁與土壤間之互制行為。實驗結果發現,上部結構位移反應隨基樁裸露
深度增加而增加,加速度則成相反之趨勢;基礎板與土壤之接觸行為明顯
影響上部結構之動態反應;樁身最大彎矩發生位置隨基礎裸露深度而降低,
但均鄰近土壤表面,且反曲點位置也隨之改變。為能有效模擬土壤與基樁
之互制行為,本研究利用SAP2000 分析軟體,參考公路橋梁耐震設計規
範,根據實測土壤剪力波速推求土壤彈簧勁度並依裸露條件適度減化彈簧
數量。數值分析結果顯示,簡化模式可忠實呈現上部結構歷時過程與最大
反應,未來可應用於實際橋梁因樁基礎沖刷裸露之耐震能力評估。
英文摘要: This study presented the shaking table tests results of a scoured bridge-pile system carried out in National Center for Research on Earthquake Engineering (NCREE) through a biaxial laminated sand box. The experimental program was characterized by the scouring depth regarding to the diameter D of the pile. Experimental results showed that the superstructure displacement increases as the pile exposure length increases, while the case is reversed for the acceleration of superstructure. The contact behavior of the footing and soil significantly influences the dynamic response of the superstructure. The maximum bending moment in the pile, constantly in the vicinity of the soil surface, lowers down as the exposure length increases, and the inflection point of the pile changes accordingly as well. The time history results in each case were compared with those obtained from simplified analytical models with linear soil springs. New methods used in the analytical models include the modified locations of soil springs, the calculation of shear wave velocity of soil, and so on. The simulation results of the acceleration and displacement of superstructure are satisfied with the test data earthquake excitations under 200 gals, particularly at the mass center of the single-degree-of freedom bridge system. It is expected to effectively predict the dynamic response of the scoured bridge with soil-structure-interaction issue.
關鍵字: 複合式災害、基礎裸露、振動台實驗、樁土互制、土壤彈簧、土壤剪力波速、耐震能力評估
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