Application of pre-stressed SMA-based tuned mass damper to a timber floor system. (15th July 2018)

• Record Type: Journal Article
• Authors: Huang, Haoyu; Chang, Wen-Shao
• Is Part Of: Engineering structures. Volume 167(2018)
• Page Start: 143
• Page End: 150
• Publication Date: 2018-07-15
• Subjects: Shape memory alloy -- Timber floor -- Tuned mass damper -- Retuning -- Footfall vibration; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2018.04.011
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: Innovative use of smart materials. Development of a novel tuned mass damper system for floor. Retuning the timber floor after change of dynamic properties. Reducing the excessive human induced vibration in timber floors. Abstract: Shape memory alloy (SMA) is becoming a popularly studied smart material in the field of structural control. The feasibility of utilising an SMA in a tuneable mass damper to reduce the excessive vibration of a timber floor system was revealed in a pilot study. However, the in-service excitations on a floor can be complex and involve more frequencies and randomness; therefore, this paper aims to assess the effectiveness of the SMA-based semi-active TMD in a real-scale timber floor, where the free vibration and human footfall-induced vibration are considered as inputs. This study is conducted using numerical simulations on OPENSEES. By reducing the floor vibration at a range of frequencies, both cooling and heating the SMA are effective in retuning the off-tuned TMD and reducing the structural response. Footfall excitation involves more than one excitation frequencies, and the higher dominant frequencies can resonate with the off-tuning frequencies, increasing the structural response. Simulation results demonstrate that retuning using SMAs can effectively lower the structural response at a wide range of frequencies, thus attenuating the footfall-induced vibration.