Shake table test and numerical study of self‐centering steel frame with SMA braces

Qiu, Canxing; Zhu, Songye

doi:10.1002/eqe.2777

Cited by 274 publications

(88 citation statements)

References 46 publications

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“…2 These results suggest that reparability is not guaranteed for these "conventional" steel frames although they are expected to survive strong earthquakes without collapse. [14][15][16][17][18][19][20][21][22][23] The superelastic effect of a SMA enables up to 10% strain to be recovered upon unloading, and this high level of recoverable strain enables more compact self-centering components. 3 Self-centering structural systems provide effective solution to the issue of unacceptable permanent deformation.…”

Section: Introductionmentioning

confidence: 99%

Self‐centering friction spring dampers for seismic resilience

Wang

Fang

Ya-shuo

et al. 2019

Earthq Engng Struct Dyn

168

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Summary This paper presents a comprehensive study on self‐centering dampers equipped with friction springs. The basic mechanical behavior of individual friction springs is first understood via analytical descriptions that are verified by a preliminary experimental study. The working principle, fabrication process, and mechanical performance of the proposed dampers are subsequently described, where the design details related to seismic applications are highlighted. This is followed by physical tests on three damper specimens, where the influence of the treatment of the taper surfaces of the friction springs on the overall damper behavior is examined, and the reliability of the dampers under repeated rounds of cyclic loading is evaluated. The damper specimens show reliable flag‐shaped load‐deformation hysteretic curves with excellent self‐centering capability. Satisfactory energy dissipation with an equivalent viscous damping (EVD) of up to 20% is shown, and the EVD is stabilized throughout the entire loading process. The dampers are capable of withstanding multiple rounds of cyclic loading with stable hysteretic behavior, indicating that they are fully reusable after multiple strong earthquakes. A larger friction coefficient on the taper surfaces leads to increased yield load and energy dissipation. Following the experimental study, some practical design recommendations are provided. Based on the available analytical model, an additional parametric study is performed to highlight the influences of precompression and friction condition of the friction springs on the damper behavior. Finally, the seismic performance of a building which adopts the friction spring dampers is evaluated via numerical simulation.

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Section: Introductionmentioning

confidence: 99%

Self‐centering friction spring dampers for seismic resilience

Wang

Fang

Ya-shuo

et al. 2019

Earthq Engng Struct Dyn

168

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“…The experimental results demonstrated that the dampers were effective in reducing both the peak and residual deformation of the structure subjected to strong earthquakes. Apart from damping systems, SMAs have also been considered in other seismic resistant devices and members, including braces, beam‐to‐column connections, base isolators, and bridges …”

Section: Introductionmentioning

confidence: 99%

Manufacturing and performance of a novel self‐centring damper with shape memory alloy ring springs for seismic resilience

Wang

Fang

Zhang

et al. 2019

Struct Control Health Monit

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Summary This paper discusses the manufacturing process and mechanical performance of a novel self‐centring damper equipped with a group of kernel elements, namely, shape memory alloy (SMA) ring springs. The study commences with an experimental investigation on individual SMA ring spring specimens, enabling a fundamental understanding of their working principle and mechanical performance. Some technical issues related to manufacturing process, low‐temperature heat treatment (annealing), quenching, and cyclic training are also discussed. Subsequently, the fabrication steps and working mechanism of the dampers incorporating the SMA ring springs are elaborated, and a further experimental study on a large‐scale prototype damper specimen is carried out. The test results show that the damper specimen exhibits satisfactory mechanical behaviour with a stable flag‐shaped load–displacement hysteretic response. A high initial stiffness and an adequate level of “yield” resistance are exhibited due to a relatively high preload applied to the SMA ring spring group. Excellent self‐centring capability with no residual displacement is observed, and satisfactory energy dissipation with an equivalent viscous damping ratio of up to 18.5% is shown. No failure to any component of the damper is observed by the end of the test. The proposed damper is expected to resist strong earthquakes and offer self‐centring driving action effectively for engineering structures without the need for repair.

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“…As such, the favorable features of superelastic SMAs attract increasing attention in the community of earthquake engineering. A variety of seismic‐resisting devices and structural components were developed during the last decades . Typical applications include dampers, isolators for buildings, restrainers for bridges, high‐performance bars, bolts and springs, and self‐centering braces …”

Section: Introductionmentioning

confidence: 99%

“…A recent investigation based on the study in Japan further suggested that the threshold of residual interstory drift ratio in determining the repairability is 0.5%, raising the urgency of developing high‐performance braces to control peak seismic demands and to reduce residual deformation after earthquakes. SMABs could be a promising solution to this problem . For example, Dolce et al, among the earliest to successfully validate the potential of using SMAs to mitigate residual deformation for structures through shaking table tests of SMA braced reinforced concrete frame.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Dolce et al, among the earliest to successfully validate the potential of using SMAs to mitigate residual deformation for structures through shaking table tests of SMA braced reinforced concrete frame. Inspired by the encouraging experimental results, more progress on SMA‐based SCCBFs were made . Zhu and Zhang, proposed an innovative SMAB, which is able to exhibit desired hysteretic behavior through proper adjustment.…”

Section: Introductionmentioning

confidence: 99%

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Effect of hysteretic properties of SMAs on seismic behavior of self-centering concentrically braced frames

Hou

Qiu

et al. 2017

Struct Control Health Monit

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Summary Shape memory alloys (SMAs) exhibit nearly ideal superelastic properties when the ambient temperature is above the austenite finish temperature, which enables them to recover deformation and dissipate energy for the seismic‐resisting structures. This unique hysteretic properties of SMAs indicate they are very promising in developing self‐centering structures. As such, recent studies installed SMAs in concentrically braced frames (CBFs) to form SMA‐based self‐centering CBFs (SCCBFs) and illustrated that the structures performed excellently with controlled peak drift and eliminated residual drift upon earthquakes. SMAs show variability in the hysteretic parameters due to the difference in metal types, crystallographic structure, component ratios, and heating treatments in producing process. Thus, this necessitates an investigation into the associated effect on the seismic performance of SMA‐based SCCBFs. To this end, this study selects 3 SMAs, proposes a bracing form, and installs SMA braces in the CBFs. Prior to the seismic analysis, all 3 frames are designed by an ad hoc design method. The focus of this paper is to understand the effect of hysteretic properties on the seismic behavior of SMA‐based SCCBFs. Intensive nonlinear time history analyses are carried out to assess the seismic performance of these structures under frequently occurred earthquakes and design basis earthquakes. The analytical results indicate the properly designed SCCBFs are able to meet prescribed performance targets and display comparable seismic demands, irrespective of the SMA types. This study suggests that using SMAs with greater hysteretic parameters is more favorable, from the perspective of saving material consumption and controlling acceleration demands.

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Shake table test and numerical study of self‐centering steel frame with SMA braces

Cited by 274 publications

References 46 publications

Self‐centering friction spring dampers for seismic resilience

Self‐centering friction spring dampers for seismic resilience

Manufacturing and performance of a novel self‐centring damper with shape memory alloy ring springs for seismic resilience

Effect of hysteretic properties of SMAs on seismic behavior of self-centering concentrically braced frames

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