【摘要】 模态参数是损伤诊断和状态评估的关键性指标,但对悬臂挡墙,由于墙体结构与墙后半无限土体相互作用机理的复杂性,目前尚无有效的方法模拟出其模态参数。文章首先通过现场脉冲锤击模态试验得出墙土系统实际模态参数,并与忽略墙后土体作用下挡墙结构模态参数对比,表明墙后土体影响效应不可忽略的基础上,对墙后土体给予墙体附加刚度、质量计算方法进行了研究,并进而进行了考虑土体影响效应时挡墙的有限元模态分析,其结果与现场测试相吻合,从而证明了土体影响效应计算方法的合理性与脉冲锤击模态测试方法的可行性。最后,在此基础上对挡墙主要损伤及破坏状态下模态参数特征及诊断方法进行了研究;为悬臂挡墙健康诊断提供了一种快速、简便、无损、有效的模态分析检测法。更多还原

【Abstract】 The modal parameters are the key indexes for the damnification diagnosis and state evaluation.But for the complexities of the structure and soil interaction effect mechanism of cantilever retaining wall system,there is still no appropriate ways to simulate the modal parameters effectively at the moment.To solve the existing problem,practical modal parameters of structure system were obtained by field impulse hammering modal test.Compared them with the modal parameters of structure system ignoring the soil influence,it was concluded that the soil influence can not be ignored.And with the consideration of soil influence,calculation methods of additional stiffness and mass were analysed and modal analysis with the finite element method was undertaken for the retaining wall as well.It was approved that the calculating method for soil influence and impulse hammering modal test is feasible with good agreement with data from field test.Finally,the main disabled modes of the retaining wall,the modal parameters characteristics under damage state and health diagnosis methods were studies and a fast,simple,lossless and effective modal analysis evaluation method was proposed for the health diagnosis of cantilever retaining wall.更多还原