Abstract
The main objective of this research is to develop a hybrid damper by combining the friction damper (FD) and the X‐shaped metallic damper (XMD) to enhance the performance of a building under seismic excitations with different peak ground accelerations (PGA). Four‐ and twelve‐storey‐reinforced concrete buildings were retrofitted with the hybrid damper, and seismic fragility, nonlinear dynamic, and life cycle cost analyses were executed on both structures to evaluate the performance of the hybrid damper and are compared with the FD and XMD of same yield load. According to the nonlinear dynamic analysis results, when a four‐storey structure is installed with the XMD, FD, and hybrid dampers, the percentage of deduction of the average of the maximum interstorey drifts is 63, 67, and 74, respectively. When a twelve‐storey structure is installed with the XMD, FD, and hybrid dampers, the percentage of deduction of the average of the maximum interstorey drifts is 59, 64, and 71, respectively. So the performance of the hybrid damper is superior to the XMD and FD in reducing interstorey drift of both structures. Results also show that the hybrid damper has enhanced the energy dissipation capacity compared to the XMD and FD under earthquakes with both low and high PGA values. According to fragility analysis results, the performance of the hybrid damper is superior to the XMD and FD in reducing the probability of attaining the collapse state. Life cycle cost analysis results show that structures with the hybrid damper acquired the shortest repair time and lowest repair cost.
Highlights
Many researchers are working on the earthquake-resistant systems to diminish the losses created by seismic excitations
To estimate the performance of the hybrid damper, a four-storey and a twelve-storey-reinforced concrete buildings were retrofitted with the hybrid damper, and the nonlinear dynamic analysis was executed on both structures by using eight earthquake ground excitations and simultaneously the hybrid damper performance is compared with the friction damper (FD) and the X-shaped metallic damper (XMD) of same yield load
When the four-storey structure is installed with the FD, XMD, and hybrid dampers, the percentage of diminution of average of the maximum interstorey drifts is 67, 63, and 74, respectively, when the twelve-storey structure is installed with the FD, XMD, and hybrid dampers, the percentage of diminution of average of the maximum interstorey drifts is 64, 59, and 71, respectively
Summary
Many researchers are working on the earthquake-resistant systems to diminish the losses created by seismic excitations. Karavasilis et al [14] developed a hybrid device by combining a self-centering device that has friction-based energy dissipation properties and a viscoelastic damper to enhance the steel frames performance under multilevels of earthquake ground motion. Is study focuses on the development of a hybrid damper by combining the FD and the XMD to enhance the seismic performance of a building when subjected to earthquake ground motions with different PGA values. To estimate the performance of the hybrid damper, a four-storey and a twelve-storey-reinforced concrete buildings were retrofitted with the hybrid damper, and the nonlinear dynamic analysis was executed on both structures by using eight earthquake ground excitations and simultaneously the hybrid damper performance is compared with the FD and the XMD of same yield load.
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