Concept and performance testing of an all-steel miniature dual stiffness damper. (August 2021)

• Record Type: Journal Article
• Authors: Wang, Weiyang; Liu, Ye
• Is Part Of: Journal of constructional steel research. Volume 183(2021)
• Publication Date: 2021-08
• Subjects: Miniature damper -- Dual stiffness -- Quasi-static test -- Low-cycle fatigue -- Stiffness model; Steel, Structural -- Periodicals; Building, Iron and steel -- Periodicals; Acier de construction -- Périodiques; Construction métallique -- Périodiques; 624.1821
• DOI: 10.1016/j.jcsr.2021.106772
• Languages: English
• ISSNs: 0143-974X

Abstract

Abstract: The double-stage yield buckling-restrained braces gradually play a role in different floors, so as to control the structural deformation pattern and hinder the weak-story collapsing. In this study, a novel all-steel damper called the miniature dual stiffness damper (MDSD) was proposed, which had the advantages of simple assembly and low cost. A series of tests was performed under quasi-static test to address the hysteretic behavior of MDSDs with different stiffness ratios of the large yield segment to the small yield segment, K yl /K ys . The test results demonstrated that MDSDs had a stable hysteretic behavior, and the dual stiffness can be achieved by yielding successively in small and large yield segments. The second stiffness of the MDSD increased with the increase of K yl /K ys when the elastic stiffness of the small yield segment kept unchanged. The low-cycle fatigue life of the MDSD was negatively correlated with the strain of the small yield segment. An in-series stiffness model for the MDSD was presented. The theoretical hysteretic curves of MDSDs were further obtained based on the proposed stiffness model, and a good accuracy was achieved. Graphical abstract: Unlabelled Image Highlights: A novel all-steel miniature dual stiffness damper (MDSD) is proposed. The small and large yield segments of the MDSD enter plastic successively, forming the dual stiffness characteristic. An in-series stiffness model and the derivation of theoretical hysteretic curves are proposed.