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Soil-structure interaction and the added-building effect: Simplified models for assisting with the prediction of ground-borne vibration in buildings

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Peer-reviewed

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Conference Object

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Authors

Sanitate, G 
Talbot, JP 

Abstract

Ground-borne vibration and re-radiated noise are an important design consideration for many modern buildings. This is particularly so in metropolitan cities, where the transport infrastructure is dense and available development sites are close to vibration sources such as underground railways. In such a context, it is important to adopt a design process that considers the vibration serviceability of a building. This often requires the assessment of potential mitigation measures, including base-isolation, in which a building is de-coupled from the ground using isolation bearings to reduce the transmitted vibration. Despite the research advances on computational models for the prediction of ground-borne vibration, it is not yet clear how to best estimate vibration levels in the building at the design stage. This is often done in practice by attempting to model the entire soil-foundation-building system by means of commercial finite-element software, which is computationally expensive and involves a high degree of uncertainty, and is therefore not ideal for design purposes. This paper presents an alternative approach that foresees the modification of the foundation vibration field by the construction of the building, and proposes simplified models that account for this “added-building” effect. The resulting vibration field can then be applied at the base of a building’s structural model, thereby avoiding the explicit modelling of the soil-foundation system. The case of a tall building is discussed in order to present the concept of a building as a discrete “damper”, and simplified expressions are formulated to account for the added-building effect. These are used to make predictions of building vibration with the help of a portal-frame model based on the dynamic stiffness method. The latter is also coupled to a more comprehensive boundary-element foundation model, based on rigid footings, to assess the effectiveness of the simplified method.

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Journal Title

25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling

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Volume Title

7

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