Abstract
Energy-dissipating or damping systems have been widely used in new and retrofitted structures for reducing earthquake damage to structural frames. Most damping devices were installed using diagonal or chevronbrace configurations, until the development of toggle-brace and scissor-jack configurations. This paper presents a modified scissor-jack-damper configuration with substantially improved efficiency. The mechanical behavior of the efficient scissor-jack-damper configuration is analyzed theoretically, and a formula for the displacement magnification factor of the configuration is proposed. A steel-frame specimen installed with the efficient scissor-jack-damper configuration was tested to verify the accuracy of the formula. The seismic responses of an uncontrolled steel-frame structure and of two controlled structures, installed with a diagonal brace and efficient scissor-jack-damper configurations, were analyzed using SAP2000. The high efficiency of the proposed scissor-jack-damper configuration is thus verified for practical engineering situations.
Highlights
In recent years, damping devices or energy dissipation systems have been widely used to dissipate the large amounts of earthquake-induced energy that would be absorbed by a structural framing system via inelastic deformations [1, 2]
The toggle-brace configuration was developed, suitable for applications involving the reduction of wind response and the mitigation of seismic-hazard in stiff structures [6, 7]. e scissor-jack-damper energy dissipation system, a variant of the toggle-brace-damper seismic-energy-dissipating system, was developed to achieve displacement magnification and to meet architectural requirements, such as providing an open space and an unobstructed view [8,9,10]
Seismic design approaches of the structure with various viscous damper installation configurations were proposed in some literature studies [11, 12]
Summary
In recent years, damping devices or energy dissipation systems have been widely used to dissipate the large amounts of earthquake-induced energy that would be absorbed by a structural framing system via inelastic deformations [1, 2]. E scissor-jack-damper energy dissipation system, a variant of the toggle-brace-damper seismic-energy-dissipating system, was developed to achieve displacement magnification and to meet architectural requirements, such as providing an open space and an unobstructed view [8,9,10]. With a view to improving mechanical performance, this study developed an efficient scissor-jack-damper configuration. The seismic response of a structure with the efficient scissor-jack-damper configuration was numerically analyzed using SAP2000 and compared with the responses of an uncontrolled structure and of a structure with a diagonal-brace configuration
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