ABSTRACT

The effective differentiation between global and local modes plays a fundamental role in the selection and application of the most appropriate seismic analysis procedures. This is particularly relevant in the case of historical heritage structures and ensembles of buildings in old city centres: due to the complexity of the structural scheme, the stratification of interventions, and the irregularity of the structural configuration with the absence of seismic details, several local modes frequently characterize the dynamic response of those structures. Distinguishing local and global modes might be challenging even from the experimental point of view in the presence of few measured degrees of freedom. Nevertheless, an accurate analysis of local modes can support the identification of macro-elements and the selection of the most appropriate analysis procedure. The present paper illustrates an original approach addressing the differentiation between global and local modes through the spatial correlation of modal displacements. The proposed approach can be either automated and integrated into software for structural analysis or applied in the context of an experimental campaign, and its application to simulated case studies is discussed.

摘要

全局模式和局部模式之间的有效区分在选择和应用最合适的地震分析程序方面起着重要作用。这在老城区中心的历史遗产结构和建筑群的情况下尤其重要：由于结构方案的复杂性、干预措施的分层以及结构配置的不规则性以及缺乏地震细节，一些地方模式经常表征这些结构的动态响应。即使从实验的角度来看，在测量的自由度很少的情况下，区分局部模式和全局模式也可能具有挑战性。尽管如此，对局部模式的准确分析可以支持宏观元素的识别和最合适的分析程序的选择。本论文说明了一种通过模态位移的空间相关性来解决全局模态和局部模态之间差异的原始方法。所提出的方法既可以自动化并集成到软件中进行结构分析，也可以应用于实验活动的背景下，并讨论了其在模拟案例研究中的应用。