Abstract
In this work, a displacement‐amplified torsional damper (DATD) is proposed for improving the seismic capacity of the beam‐column joints of a frame structure. The proposed DATD uses common steel, lead, and high‐damping rubber. This damper exhibits good energy dissipation under small earthquakes. Under strong earthquakes and large displacements, the strengthening of the high‐damping rubber can improve the overall stiffness of the damper and increase the energy dissipation. In order to investigate the performance of the proposed DATD, theoretical analyses, simulations, and cyclic loading tests were performed, and their results were compared, showing an overall good agreement.
Highlights
Energy dissipation can be achieved via a structural vibrationcontrol method that dissipates seismic energy by installing energy-dissipating members or dampers on some parts of the structure
Li et al [2] proposed a recentering shape memory alloy (SMA)-lead damper (RSLD). e seismic response of a six-story steel-frame structure, where different dampers had been installed, was investigated, and the results showed that these RSLDs have an outstanding recentering capacity
The displacement-amplified torsional damper (DATD) is installed on the beamcolumn joints. It consists of a high-damping rubber layer, an upper gear cylinder, an upper round steel plate, a middle round steel plate, a lower round steel plate, a lower gear cylinder, a lead core, and a transmission steel arm. e high-damping rubber layer is vulcanized into one body with the middle round steel plate and the upper and lower round steel plates. e main body of DATD is connected to the column through a T-shaped steel connecting plate
Summary
Energy dissipation can be achieved via a structural vibrationcontrol method that dissipates seismic energy by installing energy-dissipating members or dampers on some parts of the structure. Theoretical and experimental studies on the mechanical properties and vibration-control performance of lead rubber dampers were conducted, respectively, by Kim et al [13] and Zeynali et al [14] In these works, the damping effect of these newly proposed composite dampers was investigated through numerical simulations and experiments. Combining dampers with different energy dissipation mechanisms can result in dampers working in stages to improve the seismic performance of a structure under multilevel earthquakes. The VPD dissipates energy only by amplifying the axial strain of the viscoelastic material, whereas, under medium and large earthquakes, it dissipates energy by the viscoelastic material and the yield metal at the same time Composite dampers have their own advantages and disadvantages, but most composite dampers cannot be directly installed on the beam-column joints that are prone to damage in earthquakes.
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