论文部分内容阅读
模态参数是结构损伤识别的主要指标,然而,在墙土系统损伤诊断中仍处于探索阶段,因此,文中对墙土系统模态参数的主要影响因素进行详细分析。主要讨论了墙土系统模型和土体物理力学性质等对模态参数的影响。研究结果表明:基于低应变法测试墙土系统模态参数时,墙土系统模型的边界条件、墙土接触面、岩土材料本构模型的选择对模态参数没有影响;土体剪切波速对模态频率影响最显著,土体泊松比的影响次之,而土体密度和土体阻尼比基本没有影响,其中,模态频率与剪切波速和泊松比成线性递增关系;土体物理力学性质对模态振型没有影响。通过对这些因素的分析,得到了模态参数与相关参数之间的关系,为进一步研究墙土系统损伤诊断的方法提供了一定的参考意义。
Modal parameters are the main indicators of structural damage identification. However, the damage diagnosis of wall-soil system is still in the exploratory stage. Therefore, the main influencing factors of the modal parameters of wall-soil system are analyzed in detail. Mainly discusses the wall soil model and soil physical and mechanical properties of the modal parameters. The results show that the modal parameters are not affected by the boundary conditions, wall-soil contact surface and constitutive model of geomaterials when the modal parameters of wall-soil system are tested based on the low-strain method. The shear wave velocity Which has the most significant impact on the modal frequency, followed by the Poisson’s ratio of the soil, while the density of the soil and the damping ratio of the soil have almost no effect. Among them, the modal frequency has a linear increasing relationship with the shear wave velocity and Poisson’s ratio; Physical and mechanical properties have no effect on mode shapes. Through the analysis of these factors, the relationship between the modal parameters and the related parameters is obtained, which provides some references for the further study of the damage diagnosis of the wall-soil system.