Seismic performance of simple steel frames with buckling-restrained knee braces &amp; SMA to reduce residual displacement

Fahiminia, Mahrad; Zahrai, Seyed Mehdi

doi:10.1016/j.soildyn.2020.106268

Cited by 10 publications

(4 citation statements)

References 26 publications

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“…The result showed that SMA can improve the dynamic response of structures subjected to earthquake excitations, but the energy dissipation of structures with the BRB system was higher than that of structures with the SMA bracing system. Fahiminia et al [122] used BRKB in two structures with different numbers of layers and added SMA to the core of BRKB. Subsequently, nonlinear time-history analysis of the two structures was carried out, and the results showed that adding SMA to the BRKBs can reduce the residual deformations of the frames by more than 50%.…”

Section: Seismic Retrofittingmentioning

confidence: 99%

Advances in Shape Memory Alloy-Based Reinforcement in Steel Structures: A Review

Shao,

Huang

2023

Buildings

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The utilization of shape memory alloys (SMAs) to reinforce steel structures has been proven to be an efficient and reliable method, the structural strengthening needs can be met without the need for tensioning equipment by activating the SMAs to generate restoring stresses. This paper firstly introduces the properties of SMA, and then presents the latest research progress, opportunities and challenges of SMA in the field of steel structural reinforcement, both in terms of basic components and applications. In terms of components, the construction forms and working mechanisms of Fe-SMA strips, SMA/CFRP composite patches and SMA dampers are introduced. On this basis, the application of SMA in steel structures reinforcement is introduced, and its effect is analyzed from three aspects: crack restoration, seismic retrofitting and structural strengthening. Finally, the results of the current research are summarized and the shortcomings are analyzed, hoping to provide a reference for the research of SMA in the field of steel structures reinforcement.

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Section: Seismic Retrofittingmentioning

confidence: 99%

Advances in Shape Memory Alloy-Based Reinforcement in Steel Structures: A Review

Shao,

Huang

2023

Buildings

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“…The characteristics of a NiTi SMA model that are frequently used in the earthquake engineering community 24,30,52–63 (hereafter, referred to as the conventional model) are shown in Figure 2. The required model parameters for the conventional model are

E_{A}

E_{T}

σ_{F s}

σ_{R f}

, and

ε_{T}

, as shown in Figure 2A.…”

Section: Modeling the Functional Degradation Of Niti Shape Memory Alloysmentioning

confidence: 99%

Phenomenological hysteretic model for superelastic NiTi shape memory alloys accounting for functional degradation

Lee

Jeon

2021

Earthq Engng Struct Dyn

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This study presents a simple hysteretic model to reproduce the stress-strain relationship of superelastic NiTi shape memory alloys (SMAs). The proposed model explicitly includes the functional degradation of SMAs, which has been ignored in earthquake engineering applications. This effect causes a reduction in the transformation stress and accumulation of residual strain. Because SMA devices are mainly used for seismic retrofit and account for a small portion of the structural system, their numerical model should not increase the computational time needed to perform nonlinear dynamic analyses. Computational efficiency can be achieved by representing their stress-strain response in a phenomenological way. Additionally, practitioners who may not have a professional background in materials science can easily manipulate the proposed model for the appropriate reproduction of model parameters such as transformation stress and residual strain. The ability to properly reproduce the experimental stress-strain response is validated for the test results of 65 NiTi SMA specimens. The amount of forward and reverse transformation stress degradation and the amount of residual strain accumulation per cycle, which are observed in the experimental results, are captured with reasonable accuracy in the proposed model. Additionally, the response of SMA braces in a four-story steel moment frame is modeled using the proposed model to examine the residual story drift of the SMA braced frame under a set of ground motions. At higher intensity levels, the functional degradation of SMA braces increased the residual story drift up to 60% in comparison to the SMA-braced model without functional degradation.

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“…In addition, a new kind of BRKB based on shape memory alloy (SMA) has also been investigated for improved seismic performance. SMA material was used as the yielding core of BRKBs for its self-recentering ability, high stiffness, and good energy dissipation (Fahiminia and Zahrai, 2020; Qui et al, 2022). Because of the high cost of SMA material, short-length BRKBs are well suited for optimum use of the material.…”

Section: Introductionmentioning

confidence: 99%

Seismic design of buckling-restrained knee-braced frames considering cumulative damage

Naiyana,

Leelataviwat,

Limkatanyu

2023

Advances in Structural Engineering

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A buckling-restrained knee-braced frame (BRKBF) is an efficient structural system utilizing short buckling-restrained braces (BRBs) as knee bracing elements. Because of the shorter yielding core length compared to those of conventional BRBs, one of the key parameters concerning the performance of this system is the low cycle fatigue cumulative damage of the BRBs. This paper presents a seismic design method considering the cumulative damage, performance evaluation, and collapse assessment of 3-story, 6-story, and 9-story archetype BRKBFs. An energy-based plastic design method was utilized to design the example frames. The frames were then evaluated by nonlinear static analysis and multiple-stripe analysis (MSA). The results indicated that BRKBs were able to accommodate seismic motions with limited damage. The validity of the design methodology considering cumulative damage was also confirmed.

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Seismic performance of simple steel frames with buckling-restrained knee braces & SMA to reduce residual displacement

Cited by 10 publications

References 26 publications

Advances in Shape Memory Alloy-Based Reinforcement in Steel Structures: A Review

Advances in Shape Memory Alloy-Based Reinforcement in Steel Structures: A Review

Phenomenological hysteretic model for superelastic NiTi shape memory alloys accounting for functional degradation

Seismic design of buckling-restrained knee-braced frames considering cumulative damage

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