TADAS dampers are a type of passive structural control system used in the seismic design or retrofitting of structures.These types of dampers are designed so that they would yield before the main components of the str...TADAS dampers are a type of passive structural control system used in the seismic design or retrofitting of structures.These types of dampers are designed so that they would yield before the main components of the structure during earthquake.This dissipates a large portion of the earthquake’s energy and reduces the energy dissipation demand in the main components of the structure.Considering its suitable performance,this damper has been the subject of numerous studies.However,there are still ambiguities regarding the effect of the number of these dampers on the retrofitting of reinforced concrete(RC)frames and their design procedure.In this study,a singlestory,single-bay RC frame with the scale of 1:3,equipped with the TADAS damper,was subjected to hysteresis loading until the drift of 4%.Then,for further assessment,48 calibrated numerical models were constructed in ABAQUS and the effects of the number of TADAS dampers and column axial force upon the stiffness,strength,and ductility of the frame were accurately investigated.Also,a number of formulations were presented to calculate how the stiffness and lateral strength of the retrofitted frame are affected by an increase in the number of the TADAS plates.The results showed that if the shear capacity of the retrofitted frame is three times that of the initial frame,the structure would have the best response.In addition,if the axial force in the columns exceeds 0.2 Pcr the energy dissipation and ductility factor of the frame drastically decrease.展开更多
As an effort to minimize material utilization, seismic steel dampers designed to deform inelastically in an in-plane flexural mode have attracted serious attention recently. This paper presents a new type of metallic ...As an effort to minimize material utilization, seismic steel dampers designed to deform inelastically in an in-plane flexural mode have attracted serious attention recently. This paper presents a new type of metallic yielding damper referred to as the in-plane arch-shaped damper modified from its portal frame-shaped counterpart by replacing the straight beam with a circular arch to minimize the effects of stress concentration and warping, and therefore to avoid premature failure. Component tests of both the portal frame-shaped and arch-shaped in-plane dampers were conducted for comparison. Hysteresis loops obtained from the component tests under cyclic loads indicate substantial improvement on the energydissipative characteristics of the proposed damper. Moreover, seismic performance assessment of the proposed damper was carried out further via shaking table tests of a five-story model frame. Encouraging results have been achieved in terms of acceleration reduction, damping enhancement and peak suppression of the frequency response functions, suggesting the potential of the proposed device to be used in earthquake-resisting systems.展开更多
文摘TADAS dampers are a type of passive structural control system used in the seismic design or retrofitting of structures.These types of dampers are designed so that they would yield before the main components of the structure during earthquake.This dissipates a large portion of the earthquake’s energy and reduces the energy dissipation demand in the main components of the structure.Considering its suitable performance,this damper has been the subject of numerous studies.However,there are still ambiguities regarding the effect of the number of these dampers on the retrofitting of reinforced concrete(RC)frames and their design procedure.In this study,a singlestory,single-bay RC frame with the scale of 1:3,equipped with the TADAS damper,was subjected to hysteresis loading until the drift of 4%.Then,for further assessment,48 calibrated numerical models were constructed in ABAQUS and the effects of the number of TADAS dampers and column axial force upon the stiffness,strength,and ductility of the frame were accurately investigated.Also,a number of formulations were presented to calculate how the stiffness and lateral strength of the retrofitted frame are affected by an increase in the number of the TADAS plates.The results showed that if the shear capacity of the retrofitted frame is three times that of the initial frame,the structure would have the best response.In addition,if the axial force in the columns exceeds 0.2 Pcr the energy dissipation and ductility factor of the frame drastically decrease.
基金TSC under contract MOST 103-2625-M-009-014the Science&Technology of Fujian Province,China under Project No.2017J01495
文摘As an effort to minimize material utilization, seismic steel dampers designed to deform inelastically in an in-plane flexural mode have attracted serious attention recently. This paper presents a new type of metallic yielding damper referred to as the in-plane arch-shaped damper modified from its portal frame-shaped counterpart by replacing the straight beam with a circular arch to minimize the effects of stress concentration and warping, and therefore to avoid premature failure. Component tests of both the portal frame-shaped and arch-shaped in-plane dampers were conducted for comparison. Hysteresis loops obtained from the component tests under cyclic loads indicate substantial improvement on the energydissipative characteristics of the proposed damper. Moreover, seismic performance assessment of the proposed damper was carried out further via shaking table tests of a five-story model frame. Encouraging results have been achieved in terms of acceleration reduction, damping enhancement and peak suppression of the frequency response functions, suggesting the potential of the proposed device to be used in earthquake-resisting systems.
