CUED Publications database

An experimental investigation of soil-structure interaction in a sway frame structure with tuned mass dampers

Jabary, RN and Madabhushi, SPG (2014) An experimental investigation of soil-structure interaction in a sway frame structure with tuned mass dampers. In: UNSPECIFIED pp. 741-747..

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Abstract

Tuned mass dampers (TMDs) are effective vibration resisting devices that are commonly used in structures to protect against wind, human or seismically induced loading. The frequency of these dampers is normally set to coincide with the most pre-dominant modal frequency of the structure and is usually determined by considering structural properties alone. In reality, soil-structure interaction (SSI) may cause de-tuning of the mass damper through altering the system properties. This could lead to a loss of the damper's operational efficiency and even an amplification of structural response. Past studies into TMD operations have mainly dealt with the development of analytical expressions for the optimisation of the TMD parameters mass, stiffness and damping. Prior to Ghosh and Basu (2004) no authors had looked into the effects of SSI on TMD performance. The limited number of experimental studies conducted on TMDs have mainly relied on field data to evaluate long-term TMD performance. This paper presents the findings from a number of shaking table tests performed on a 3-degrees-of-freedom sway frame structure model fitted with a range of TMD configurations interchangeably positioned on the various floors of the structure. The objective of this paper is to experimentally depict the effects of various tuned and de-tuned mass damper configurations on the response of a multi-storey structure interchangeably situated on a fixed bed and a soil bed. Experimental findings suggest that positioning of a TMD along the height of the structure is crucial for its effectiveness and that regardless of whether it is tuned to the soil-structure system properties, a TMD may still amplify the isolated structural response. This could potentially have major implications for existing and new structures fitted with TMDs for seismic protection.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:34
Last Modified: 12 Oct 2017 01:51
DOI: