【摘要】 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。更多还原

【Abstract】 The modal parameters are the major indexes of structural damage identification.However,damage diagnosis on soil-wall system is still in the stage of exploration.Hence,the influence factors affecting the modal parameters have been in detail analyzed.The influence factors,such as soil-wall system model,physical and mechanical properties of soil and so on are discussed in this paper.The results show that: the boundary conditions,soil-wall contact,constitutive model of soil,density of soil,damp ratio of soil have no influence on modal parameters,and the shear wave velocity of soil,Poisson ratio of soil have remarkable influence on modal frequency,but they have no influence on modal shape.Among them,the relation among shear wave velocity of soil,poisson ratio with modal frequency increased linearly.Through the factors analyzed that the relationship between the modal parameters and the correlation parameter has been obtained,providing certain reference for further study of the method of damage identification on soil-wall system.更多还原