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 In this paper, the dynamic shear modulus and damping ratio of soils are taken as random variables. By using the random finite element method and Fourier transformation technique, the recurrence equations of finite element are established in frequency domain. The dynamic nonlinearity of soil is approximately simulated by equivalent linearization approach through the iterative procedure. The variation of dynamic response of soil layers caused by the variation of soil parameters is investigated. The horizontal... In this paper, the dynamic shear modulus and damping ratio of soils are taken as random variables. By using the random finite element method and Fourier transformation technique, the recurrence equations of finite element are established in frequency domain. The dynamic nonlinearity of soil is approximately simulated by equivalent linearization approach through the iterative procedure. The variation of dynamic response of soil layers caused by the variation of soil parameters is investigated. The horizontal soil layers are taken as an example and the dynamic responses are calculated. The results show that the amplitude of the coefficients of variation of dynamic response is almost the same of those of soil parameters.  本文将土料的动剪模、阻尼比等作为随机量处理,引入随机有限元法和富里叶变换技术,在频域内建立有限元递推方程;同时利用等价线性化法通过迭代循环来近似模拟土料动力特性的非线性,集中分析了土料动力参数的变异性引起的土层反应变异性,以水平成层地基为例进行了具体计算,结果表明,土层地震反应的变异性与输入土动力参数的变异性具有相同的量级。  By means of optimization theory,a method is developed to solve the incompatibility between the input amplitudes used to calculate the equivalent properties of nonlinearities and the corresponding output deflections,which is created by applysing the equivalent linearization approach to analyze of limit cycle hunting of a bogie with more than one nonlinearity.By constructing a coupling analysis scheme of amplitude,equivalent stiffness and critical hunting speed,the equivalent linearization... By means of optimization theory,a method is developed to solve the incompatibility between the input amplitudes used to calculate the equivalent properties of nonlinearities and the corresponding output deflections,which is created by applysing the equivalent linearization approach to analyze of limit cycle hunting of a bogie with more than one nonlinearity.By constructing a coupling analysis scheme of amplitude,equivalent stiffness and critical hunting speed,the equivalent linearization method can be used not only to solve limit cycle hunting with sufficient accuracy,but also to analyse its stability.The results of numerical integration fully verify the method developed in the paper.  借助于最优化方法，本文成功地解决了用等效线化方法分析含有多个非线性环节的转向架蛇行极限环时所产生的用于计算非线性环节等效线化值的输入幅值与相应的输出幅值之间的不协调问题。井通过构造振幅～等效线化刚度～等效线化分析所得蛇行速度（即ａ～Ｋｅｑ（ａ）～ＶＨ）耦联图，使得等效线化分析方法不仅能以较好的精度用于求蛇行极限环解，而且可以用于分析蛇行极限环的稳定性。数值积分结果充分证实了本文分析方法的正确性。  In this paper, the equivalent linearization approach together with three dimensional finite element method is used in dynamic nonlinear analysis of seismic response of Hongjiadu concrete faced rockfill dam (CFRD). Based on a number of numerical computations, the effects of the variations of dynamic parameters of rockfill materials on seismic response behavior of CFRD are studied. The initial shear modulus at small strain, the nonlinear variations of shear modulus, and damping ratio with shear strain... In this paper, the equivalent linearization approach together with three dimensional finite element method is used in dynamic nonlinear analysis of seismic response of Hongjiadu concrete faced rockfill dam (CFRD). Based on a number of numerical computations, the effects of the variations of dynamic parameters of rockfill materials on seismic response behavior of CFRD are studied. The initial shear modulus at small strain, the nonlinear variations of shear modulus, and damping ratio with shear strain are taken into account. Besides, the dependence of the variation curves of shear modulus with shear strain on confining pressure is considered. The general characteristics of seismic response of CFRD, including the distribution of peak accelerations of rock fills and dynamic stresses of concrete slab, under different combinations of the related factors, are discussed. Some findings and conclusions, which are helpful to understand the earthquake resistant behavior of CFRD, are drawn through comparative studies.  本文通过变化堆石料微小应变下的剪切模量以及剪切模量衰减曲线和阻尼比递增曲线的取值范围 ,利用三维等价线性有限元动力分析方法研究了材料动力特性对于高混凝土面板堆石坝的地震反应的影响。多种方案的计算结果对比分析表明 ,坝料的动力特性对于面板堆石坝等效线性振动体系自振特性、堆石体地震响应与面板动应力等具有显著的影响。   << 更多相关文摘 
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