以動態離心模型試驗模擬不同型式基礎建築物於液化地盤之受震反應; Centrifuge modeling on seismic responses of building with different foundations in liquefiable ground

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题名:	以動態離心模型試驗模擬不同型式基礎建築物於液化地盤之受震反應;Centrifuge modeling on seismic responses of building with different foundations in liquefiable ground
作者:	楊子霈;Yang,Tzu-Pei
贡献者:	土木工程學系
关键词:	淺基礎;地下室基礎;土壤液化;加速度放大效應;超額孔隙水壓;地工離心機;shallow foundation;base footing;soil liquefaction;centrifuge shaking table test
日期:	2013-08-08
上传时间:	2013-10-08 09:28:26 (UTC+8)
出版者:	國立中央大學
摘要:	本研究設計兩組重量相同但高度分別為一層樓高(3m)及五層樓高(15m)之建築物模型，並搭配五種不同型式基礎，包括獨立基腳基礎、筏式基礎、地下室基礎、摩擦樁基礎與點承樁基礎，於50g離心重力場下進行模型受震試驗，於試體內部不同深度分別安裝加速度計、孔隙水壓計、土壓力計、線性差動變壓器(LVDT)、雷射位移計以及樁身應變計，藉以觀察受振液化時地盤與建築物之動態反應。研究結果顯示：(1)土壤未液化時，地盤加速度有放大效應，隨建築物越高加速度放大效應越明顯；但當土壤達到液化狀態後，液化層能有效隔絕振波的傳遞，對建築物有明顯的減震效應；(2)施加的振動越大，液化土層的深度越深，超額孔隙水壓消散時間較長，液化持續時間也較久；(3)使用地下室基礎以及點承樁基礎之建築物因基礎埋置深度較深，有較佳的力學機制，受振時建築物搖晃行為較小，振後建築物之變形較小；(4)五層樓高建築物使用獨立基腳基礎、筏式基礎與摩擦樁基礎之抗液化能力較差，而地下室基礎與點承樁基礎之抗液化能力較佳。 A series of centrifuge shaking tble tests were performed to investigate the settlement and seismic behavior of building on liquefiable ground with different types of foundation. Tested models are divided into two groups according to the height of structure but with the same weight. For all the models, the accelerometers, the pore water pressure transducers, the linear variable differential transformers (LVDTs) and the earth pressure cells were installed to observe the seismic response of the ground and building during and after soil liquefaction. Several srain gages were also attached on the pile foundation to measure the bending moment and axil force. According to the test results, the following conclusions are made: (1) when the soil does not liquefy, the accelarion is amplified significantly from the base of soil stratum to the top of structure. On the other hand, the liquefied soil layer obstructs the shear wave propagation leading to the decrease of rocking behavior of building. (2) The larger input base acceleration would result in longer dispation time of excess pore water pressure and the larger settlement of building. (3) The rocking behavior of five-story building is significant than that of one-story building when thay have the same weight. (4) The larger embedment depth of foundation leads to the smaller settlement and restrain the rocking behavior of structure during shaking.
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