TADAS dampers in very large deformations

• Published in: International journal of steel structures Vol. 17; no. 2; pp. 515 - 524
• Main Authors: Mohammadi, Reza Karami, Nasri, Arman, Ghaffary, Azin
• Format: Journal Article
• Language: English
• Published: Seoul Korean Society of Steel Construction 01.06.2017; Springer Nature B.V; 한국강구조학회
• Subjects: Axial forces; Beams (structural); Civil Engineering; Computer simulation; Damping; Deformation mechanisms; Devices; Earthquake damage; Earthquake dampers; Earthquakes; Engineering; Finite element method; Hazards; Materials Science; Mathematical models; Passive control; Plates (structural members); Retrofitting; Seismic analysis; Seismic design; Seismic engineering; Solid Mechanics; Stiffness; Structural damage; 토목공학; TADAS damper; structural damage; large deformations; test; simulation; improper geometric characteristic
• ISSN: 1598-2351; 2093-6311
• DOI: 10.1007/s13296-017-6011-y

Triangular-plate Added Damping and Stiffness (TADAS) dampers are special kinds of passive control devices that can be used in seismic design and retrofitting of structural systems. However, when exposed to large deformations, primary members of a structure can be in danger of serious damage due to improper geometric characteristics of these dampers. In this study, response of a one bay frame equipped with a TADAS device, previously tested in the laboratory, was simulated using a detailed FE model in ABAQUS. A monotonic analysis was then conducted on the TADAS damper alone, which indicated that in large deformations, TADAS damper pins hit the top of the holes, resulting in an abrupt stiffness increase in the damper. Seismic analysis of a six story moment resisting frame with TADAS dampers, using a series of twelve scaled earthquake ground motions, was also conducted in OpenSees which indicated that with sudden stiffness increase in dampers, the value of moments in beams as well as axial forces in braces will increase, causing possible damages in these areas. At the end, a method for calculating the optimal height for the holes in the damper was proposed, which is shown to be in good agreement with detailed ABAQUS models.