An innovative C-shaped yielding metallic dampers for steel structures

Farsi, A.; Amiri, Hamid Reza; Manshadi, S.H. Dehghan

doi:10.1016/j.istruc.2021.08.069

Cited by 15 publications

(8 citation statements)

References 16 publications

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“…Thus, the ultimate strength and stiffness of the frame can be expressed using Eqs. ( 9) and (10), where 'n' represents the number of dampers used in the frame, and denotes the ultimate stress of the damper, which is equal to 69 MPa [18]. Figs.…”

Section: Verification Of Aydmentioning

confidence: 99%

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Numerical Investigation of the Effect of Aluminum Yielding Damper for the Retrofitting of Semi-rigid Steel Frames

Aghani,

Cheraghi,

Bakhshipour

2023

Period. Polytech. Civil Eng.

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During an earthquake, yielding dampers yield before the main members of the structure and with their plastic deformations, they dissipate part of the earthquake energy. Therefore, ductile materials are a suitable option for this type of dampers. In this research, numerical studies were conducted to investigate the effect of aluminum yielding damper (AYD) on semi-rigid steel frame. First, the steel frame and the AYD were verified based on experimental samples and analytical equations. An approximate equation for estimating the elastic stiffness of the damper was also presented. Parametric studies were conducted in order to investigate the effect of the number of dampers and the axial force of the column on the stiffness, ultimate strength, ductility and energy dissipation parameters of the frame. The additional forces applied to the connections, beams and columns of the frame due to the addition of dampers were also calculated, which is important in the design of the frame. The results showed that the addition of the damper increased the frame's stiffness, energy dissipation, ultimate strength, and ductility, and also reduced the negative effect of the column's axial force on energy dissipation of the frame.

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Section: Verification Of Aydmentioning

confidence: 99%

“…Until now, different geometries of yielding dampers have been used to strengthen concrete and steel structures. Farsi et al [10] proposed a C-Shaped Damper (CSD) for braced frame structures. The CSD dissipates earthquake energy using sacrificial C-Shaped elements, protecting main structural elements.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Effect of Aluminum Yielding Damper for the Retrofitting of Semi-rigid Steel Frames

Aghani,

Cheraghi,

Bakhshipour

2023

Period. Polytech. Civil Eng.

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“…Various supplementary energy dissipation devices have been detailed in the literature, and these can be distinguished based on the required mechanism for activation [5]. Depending on their responsiveness to seismic excitation, these additional energy dissipation systems can be classified as either active or semi-active systems (such as Active Bracing Systems, Active Mass Dampers, Variable Stiffness or Damping Systems, Smart Materials) or passive systems (such as Metallic Dampers, Friction Dampers, Viscoelastic Dampers, Viscous Fluid Dampers, Tuned Mass Dampers, Tuned Liquid Dampers) [3,[6][7][8][9]. These devices employ varying techniques to mitigate the impact of earthquakes on buildings [2,4,10,11].…”

Section: Introductionmentioning

confidence: 99%

Optimization methods for the design of advanced 3d‐printed metal seismic dissipation devices

Andreacola,

Brando

2023

ce papers

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In recent years, the topic of passive building protection became increasingly relevant due to the intense seismic activity in many parts of the world, often impacting densely populated areas. In the meantime, modern additive manufacturing technologies enabled the introduction of devices for structural applications that are innovative both in terms of final shape and design methods. The aim of the research project is to develop metal energy dissipation devices (dampers) from conventional geometric shapes and then direct the design towards specific performance in terms of strength, stiffness and dissipative capacity through optimization algorithms, with the aim of optimizing their function when employed as damper for the seismic protection of buildings. The subsequent removal of parts in excess of the real structural needs makes it possible to pursue important goals such as saving material, and reducing weight and costs. The proposed study illustrates the results of the first dampers designed through advanced topological and geometric optimization algorithms, implemented within the Abaqus software. The early models, designed from a spherical shape, are conceived to withstand axial stresses, simulating the load that can be transferred through a diagonal brace during an earthquake.

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“…To date, numerous passive energy‐dissipating devices have been proposed to improve the seismic behavior of structures. These devices can be categorized as friction dampers, 2 viscoelastic dampers, 3 and metallic yielding dampers 4 . Among existing dampers, researchers 2–5 had shown that metallic dampers are the most economical candidates.…”

Section: Introductionmentioning

confidence: 99%

“…These devices can be categorized as friction dampers, 2 viscoelastic dampers, 3 and metallic yielding dampers 4 . Among existing dampers, researchers 2–5 had shown that metallic dampers are the most economical candidates. Also, metallic dampers show a stable hysteresis with significant dissipation of seismic energy especially when they are used for improving the behavior of concentrically braced frame (CBFs) systems.…”

Section: Introductionmentioning

confidence: 99%

Improving the behavior of concentrically braced frame braces using a flexural damper: Experimental and numerical study

Jeong,

Ghamari,

Jawdhari

2023

Structural Design Tall Build

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SummaryAlthough the concentrically braced frames (CBFs) systems have high lateral elastic stiffness and strength, they reflect a low seismic energy absorption capacity mainly due to their diagonal buckling under compressive loading. To overcome this problem, researchers have proposed metallic shear damper as the most popular due to its satisfactory performance and affordable cost. In this paper, an innovative metallic damper with a flexural mechanism is proposed to improve the behavior of CBF systems. It provides ease of fabrication and replacement after damage, competitive cost, and improved resistance to buckling of the CBF member. The performance of the damper was evaluated experimentally and numerically. Subsequently, two types of dampers, (a) made of rectangular flexural plates (RFP) and (b) made of I‐shaped flexural plates (IFP), were designed and evaluated. Experimental as well as numerical results indicated that both dampers provide stable and symmetrical hysteresis curves with a high energy absorption capacity. Results indicated that the IFP damper has greater stiffness (1.94–2.3 times) and ultimate strength (1.76 times) but a lower overstrength (66% less) and ductility (47% less) than the RFP damper. Moreover, design expressions were presented for the proposed damper and showed a good agreement with finite element results.

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An innovative C-shaped yielding metallic dampers for steel structures

Cited by 15 publications

References 16 publications

Numerical Investigation of the Effect of Aluminum Yielding Damper for the Retrofitting of Semi-rigid Steel Frames

Numerical Investigation of the Effect of Aluminum Yielding Damper for the Retrofitting of Semi-rigid Steel Frames

Optimization methods for the design of advanced 3d‐printed metal seismic dissipation devices

Improving the behavior of concentrically braced frame braces using a flexural damper: Experimental and numerical study

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