Rehabilitation of SDOF systems under air blast loading with a modified negative stiffness amplifying damper

Article

Kiran, K. K., Farsangi, Ehsan Noroozinejad, Gharehbaghi, Vahidreza and Bogdanovic, Aleksandra. 2022. "Rehabilitation of SDOF systems under air blast loading with a modified negative stiffness amplifying damper." Journal of Building Pathology and Rehabilitation. 7 (1). https://doi.org/10.1007/s41024-022-00178-x
Article Title

Rehabilitation of SDOF systems under air blast loading with a modified negative stiffness amplifying damper

Article CategoryArticle
AuthorsKiran, K. K., Farsangi, Ehsan Noroozinejad, Gharehbaghi, Vahidreza and Bogdanovic, Aleksandra
Journal TitleJournal of Building Pathology and Rehabilitation
Journal Citation7 (1)
Article Number44
Number of Pages15
Year2022
PublisherSpringer
Place of PublicationGermany
ISSN2365-3159
2365-3167
Digital Object Identifier (DOI)https://doi.org/10.1007/s41024-022-00178-x
Web Address (URL)https://link.springer.com/article/10.1007/s41024-022-00178-x
Abstract

Modified negative stiffness amplifying damper (MNSAD) is a novel vibration control device expected to consist of a negative stiffness spring with flexible cladding material. In this system, a dashpot is used in conjunction with the negative stiffness spring, and the damping magnification effect is greatly enhanced by amplifying the stoke of the dashpot. The negative stiffness property is preserved, and the MNSAD takes into account significant damping magnification effects. In this study, displacement and acceleration responses of SDOF systems under air blast load equipped with an MNSAD are investigated, which takes stochastic responses into account. Next, the optimum designed parameters yield three key parameters: stiffness ratio, damping ratio, and negative stiffness ratio. Following that, the SDOF system's responses to air blast load are calculated. It was observed that a significant damping effect is achieved by adding small damping (i.e., 2.8%) to the SDOF system with the proposed MNSAD. It was also discovered that replacing NSAD with MNSAD increases the long period structure's energy dissipation capacity from 16 to 28%.

KeywordsEnergy ratio ; SDOF ; Air blast load ; Negative stiffness amplifier damper ; Modified negative stiffness amplifier damper ; Stochastic response ; Resilience
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Byline AffiliationsSJB Institute of Technology, India
Graduate University of Advanced Technology, Iran
University of Southern Queensland
Ss. Cyril and Methodius University in Skopje, Republic of North Macedonia
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