Design method of structural retrofitting using viscous dampers based on elastic–plastic response reduction curve. (1st April 2020)

• Record Type: Journal Article
• Authors: Shen, Hua; Zhang, Ruifu; Weng, Dagen; Ge, Qingzi; Wang, Chao; Islam, Md Mofakkharul
• Is Part Of: Engineering structures. Volume 208(2020)
• Publication Date: 2020-04-01
• Subjects: Viscous damper -- Design method -- Elastic–plastic response reduction curve -- Energy dissipation -- Passive control; 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.2019.109917
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: An elastic-plastic design method is proposed based on EPRRC using viscous dampers. Inelastic behaviour of primary structure can be directly considered. Reduction in storey drift and shear force can be simultaneously realized. Modular design flowchart is presented to facilitate ease of retrofit design. Abstract: Installation of viscous dampers has been demonstrated to be an effective method to perform seismic retrofitting of a structure. However, most of the existing design methods are based on the elastic stage of the primary structure. The proposed study presents an alternate method for retrofit design of a structure using viscous dampers whilst considering inelastic behaviour of the primary structure. The said method makes use of the elastic–plastic response reduction curve (EPRRC) to reflect the relationship between characteristic parameters of the viscous damper, supporting brace, and response of the viscous-damper-equipped primary structure. Use of this method ensures that reduction in storey drift as well as shear force is simultaneously realized within the EPRRC coincident reduction region. Thus, parameters concerning the required dampers and supporting braces can be obtained from EPRRC in accordance with target performances of the damped structure. Comparison between a traditional elastic response reduction curve (ERRC) and EPRRC indicates that ERRC tends to overestimate the performance of damped structures. Nonlinear time-history analysis was performed to verify the effectiveness of the proposed method when applied to a benchmark model. Additionally, probabilistic reliability of the said method was determined via incremental dynamic analysis. Results demonstrate that the proposed design method can effectively satisfy design requirements under different seismic intensities.