Damage-free self-centring links for eccentrically braced frames: development and numerical study

Lettieri, Annarosa; Peña, Amparo de la; Freddi, Fabio; Latour, Massimo

doi:10.1016/j.jcsr.2022.107727

Cited by 15 publications

(12 citation statements)

References 54 publications

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“…The interested reader can refer to Lettieri et al [21] for additional details on the behaviour of the proposed SClink.…”

Section: Seismic Demand and Cyclic Behaviourmentioning

confidence: 99%

“…The seismic performance of the EBF and SC-EBF is evaluated and compared. 2D FE models of the systems have been developed in OpenSees according to the modelling approach described in Lettieri et al [21]. The structures are characterised by the same fundamental period of vibration of 0.79 sec.…”

Section: Global Responsementioning

confidence: 99%

“…In contrast, post-tensioning in the PT-bars is modelled by applying a 'predefined field temperature'. Additional modelling details can be found in Lettieri et al [21].…”

Section: Experimental Campaignmentioning

confidence: 99%

“…Within this context, the authors have recently proposed a damage-free self-centring link (SC-link) for EBFs [21]. The seismic device, located between the collector beams and connected through pins, employs post-tensioned highstrength steel bars (PT-bars) with disk springs to control the self-centring capacity of the frame and friction devices (FDs) to dissipate seismic energy.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical study of a damage‐free self‐centring link for seismic resilient EBFs

Lettieri,

Freddi,

Latour

2023

ce papers

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Significant progress has been made in recent years for the definition of seismic‐resilient structures, chasing the urgent need for structures able to return to undamaged, fully functional conditions in a short time after an extreme event. Seismic‐resilient steel structures have been widely investigated, mainly considering solutions based on moment‐resisting and concentrically braced frames. However, while the first category may be characterised by low stiffness, the second is often characterised by low ductility. Eccentrically Braced Frames (EBFs) allow overcoming these drawbacks and well‐balance stiffness, strength and ductility. This paper presents the numerical and experimental study of a damage‐free self‐centring link for EBFs. The proposed device uses post‐tensioned bars to control the self‐centring behaviour and friction devices to provide dissipation capacity. Experimental cyclic tests have been carried out to evaluate the response of the device. A 3D ABAQUS model has been developed to investigate the local response. Finally, a six‐storey EBF has been numerically investigated in OpenSees to evaluate the global response. Incremental Dynamic Analyses were performed demonstrating the increased seismic performance of the proposed solution.

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“…The interested reader can refer to Lettieri et al [21] for additional details on the behaviour of the proposed SClink.…”

Section: Seismic Demand and Cyclic Behaviourmentioning

confidence: 99%

Section: Global Responsementioning

confidence: 99%

“…In contrast, post-tensioning in the PT-bars is modelled by applying a 'predefined field temperature'. Additional modelling details can be found in Lettieri et al [21].…”

Section: Experimental Campaignmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental and numerical study of a damage‐free self‐centring link for seismic resilient EBFs

Lettieri,

Freddi,

Latour

2023

ce papers

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“…The implementation of SC coupling beams can be an efficient solution to address the issues related to earthquakeinduced residual deformations. Different configurations of SC coupling beams taking advantage of post-tensioned bars/cables have been proposed in literature [9][10][11][12][13]. These configurations are often based on a gap-opening mechanism at beam-to-wall interfaces.…”

Section: Introductionmentioning

confidence: 99%

Seismic performance assessment of self‐centering hybrid coupled walls: an 8‐story case study structure

Farahi,

Freddi,

Latour

2023

ce papers

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In response to the demand for resilient structures, a variety of innovative structural solutions have been recently introduced to reduce residual deformations and expedite the repair of structures subjected to earthquakes. This paper discusses the seismic performance of a self‐centering lateral load‐resisting system developed with the intent of diminishing earthquake‐induced damage and residual deformations. The proposed solution is composed of a reinforced concrete (RC) shear wall coupled to two steel side columns with coupling beams featuring a friction‐damped self‐centering mechanism. The intended system is referred as Self‐Centering Hybrid Coupled Wall (SC‐HCW). The applied self‐centering mechanism is aimed at reducing earthquake‐induced residual deformations. Limited residual deformations facilitate the repair of SC‐HWs after severe earthquakes, which improves the seismic resilience of the structure. The seismic performance of a SC‐HCW is examined and compared with that of a conventional hybrid coupled wall (HCW). Nonlinear static and Incremental Dynamic Analyses (IDAs) are conducted on these archetypes. The outcomes elaborate the efficiency of the SC‐HCW in minimizing earthquake‐induced residual deformations.

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Shaking table tests and numerical analysis of RC coupled shear wall structure with hybrid replaceable coupling beams

Gong,

Freddi,

2024

Earthq Engng Struct Dyn

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A variety of innovative structural solutions have been recently introduced to mitigate damage and expedite the repair of buildings subjected to extreme seismic events, hence contributing to the urgent need for resilient societies. In this context, the present study experimentally and numerically investigates an innovative reinforced concrete (RC) shear wall (SW) structure with replaceable coupling beams (CBs) equipped with hybrid devices. These hybrid devices couple metallic and viscoelastic dampers and aim at satisfying multiple lateral load performances effectively. To assess the seismic performance of the proposed coupled SW system and verify the design principle, comparative shaking table tests were performed on two 1/4‐scale seven‐story SW structure specimens, including a conventional RC coupled SW and the proposed coupled SW with hybrid devices. The tests results indicate the improved performance of the proposed compared with the conventional system in terms of: (1) reduced interstory drifts and story accelerations demand under a wide range of seismic intensities, (2) concentrated damage in the hybrid device and minimal damage to the other components contributing to the reparability of the structure. Furthermore, 3D finite element models for the shaking table test specimens were established in OpenSees and validated against experimental response. Successively, a numerical parametric study was conducted by performing non‐linear response history analyses under a set of 22 ground motions to investigate the influence of different design configurations of the hybrid device on the peak interstory drifts and peak story accelerations.

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Damage-free self-centring links for eccentrically braced frames: development and numerical study

Cited by 15 publications

References 54 publications

Experimental and numerical study of a damage‐free self‐centring link for seismic resilient EBFs

Experimental and numerical study of a damage‐free self‐centring link for seismic resilient EBFs

Seismic performance assessment of self‐centering hybrid coupled walls: an 8‐story case study structure

Shaking table tests and numerical analysis of RC coupled shear wall structure with hybrid replaceable coupling beams

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