论文部分内容阅读
基于ABAQUS有限元软件开发平台,对Ramberg-Osgood土动力非线性本构模型进行了修正。通过合理的假设得出了模型修正参数、R的取值方法和算法。滞回曲线加卸载规律符合修正后的Masing准则。并进行了三维场地地震动非线性分析,分析了不同输入峰值的地震波对土体应力-应变关系的影响,并与一维场地动力分析Shaking程序的计算结果进行了比较。分析结果表明,非线性分析时的水平位移和相对位移要大于等效线性情况下的相应位移,这表明采用何种本构关系将影响到得到的场地的地震动反应结果,因此,在工程应用时需加以合理的选择,并对最终结果做出合理的判断。
Based on ABAQUS finite element software development platform, the dynamic nonlinear constitutive model of Ramberg-Osgood soil is modified. Through reasonable assumptions, we get the model modification parameters, the value of R and the algorithm. Hysteresis curve loading and unloading law in line with the revised Masing criteria. The nonlinear analysis of ground motions in 3D is carried out. The influence of seismic waves with different input peaks on the stress - strain relationship of soil is analyzed. The results are compared with those of the Shaking program. The analysis results show that the horizontal and relative displacements in the nonlinear analysis are greater than those in the equivalent linear case, which indicates that the constitutive relationship will affect the seismic response of the obtained site. Therefore, in engineering application When the need to be a reasonable choice, and to make a reasonable judgment of the final result.