节点文献

水平地层地震动力反应分析

Seismic response characteristic of horizontal layer

  • 推荐 CAJ下载
  • PDF下载
  • 不支持迅雷等下载工具,请取消加速工具后下载。

【作者】 丰土根刘汉龙高玉峰费康

【Author】 FENG Tu-gen1,2,LIU Han-long1,2,GAO Yu-feng1,2,FEI Kang3(1.Ministry of Water Resources Key Laboratory of Geotechnical Engineering,Hohai University,Nanjing 210098,China;2.Research Institute of Geotechnical Engineering,Hohai University,Nanjing 210098,China;3.Institute of Architectural Science and Civil Engineering,Yangzhou University,Yangzhou 225009,China)

【机构】 河海大学岩土工程水利部重点实验室河海大学岩土工程科学研究所扬州大学建筑科学与工程学院

【摘要】 根据Iai多重剪切机构塑性模型及边界面塑性模型的特点,建立了一个砂土多机构边界面塑性模型。该模型将土复杂的变形机理分解为体积机理和一系列简单的剪切机理。用边界面弹塑性模型模拟多重剪切机构塑性模型中虚拟单剪机构,避免了Iai多重剪切机构塑性模型在利用修正M asing准则模拟虚拟单剪应力应变关系时,确定比例参数的复杂性。根据大量试验资料,建立了液化面参数与归一累积剪切功的关系,能够用较少的参数很好地建立有效应力路径。由于多重机理的特性,模型能够模拟复杂荷载作用下主应力轴偏转的影响。用多机构边界面塑性模型对饱和砂土水平场地进行有效应力分析,对水平场地的地震反应特性进行了分析,由于多机构边界面塑性模型能同时考虑振动孔隙水压力的发展引起的有效应力降低导致饱和砂土抗剪强度和模量的降低。分析表明,结果是合理的。模型简单实用,将方便在工程实践中的应用。

【Abstract】 According to the characteristics of Iai′s multiple mechanism plasticity model and boundary surface plasticity model,a multiple mechanism boundary surface plasticity model of saturated sand was established.The concept of multiple mechanism was used as a vehicle for decomposing the complex mechanism into a set of simple shear mechanisms defined in one dimensional space.Each virtual simple shear mechanism was simulated by the boundary surface plasticity model in the virtual stress and strain space,with which the complexity of getting the scale parameters was avoided when each virtual simple shear mechanism was simulated by the modified Masing′s rule in Iai′s multiple mechanism model.Based on a lot of test data,the relation between the liquefaction front parameter and the normalized shear work was presented.The effective stress path was well modeled by several parameters.The effect of rotation of principal stress axial directions and large shear displacement of sand in the earthquake induced liquefaction were taken into account at the same time in the model.The computed results were consistent with the laboratory results.Based on the multiple mechanism boundary surface plasticity model,an analysis of effective stress on the horizontal layer of the saturated sand and of the seismic response characteristics of the horizontal layer were given.The multiple mechanism boundary surface plasticity model simultaneously con-sidered the decrease of shear strength and the modulus of the saturated sand by the development of vibration pore water pressure.The analysis shows that the results are reasonable,and the model is simple and practical which makes the engineering application much easier.

【基金】 教育部科学技术研究重点资助项目(109077);水利部公益性行业科研项目(200801014)
  • 【文献出处】 解放军理工大学学报(自然科学版) ,Journal of PLA University of Science and Technology(Natural Science Edition) , 编辑部邮箱 ,2009年S1期
  • 【分类号】P315.2
  • 【被引频次】2
  • 【下载频次】229
节点文献中: