土-结构系统的非线性参数反演研究

Nonlinear Parameter Inversion of Soil-Structure System

研究土-结构系统的非线性参数反演问题.建立了土-结构系统的二维集中质量非线性计算模型,提出了变量分离的非线性参数拟合法.利用非线性计算模型和变量分离的非线性参数反演法,实现了复杂的土-结构系统的非线性参数反演.以湖南大学建立的野外大比例尺土-结构系统的试验模型为算例,利用地震输入和系统响应,对系统的非线性动力参数进行反演.算例表明,该算法计算量小,反演精度高,可用于土-结构系统的非线性参数的在线反演.

The parameter inversion problem of soil-structure system was investigated. The 2-D lumped mass nonlinear model was established to simulate the soil-structure system, and the variables separated nonlinear parameters inversion method was proposed. The nonlinear parameters of the complicated soil-structure system were inversed according to this nonlinear calculating model and this inversion method. A field large-scale soil-structure system in Hunan University was taken as the example, and the nonlinear dynamic parameters of the system were inversed according to the seismic input and the system response. The results show that the analysis model in this paper has less computation and the algorithm is valid, which can be used for the online nonlinear parameter inversion of the soil-structure system in engineering.