Variable-friction self-centering energy-dissipation braces (VF-SCEDBs) with NiTi SMA cables for seismic resilience

Chen, Junbai; Fang, Cheng; Wang, Wei; Liu, Yongqing

doi:10.1016/j.jcsr.2020.106318

Cited by 72 publications

(31 citation statements)

References 37 publications

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“…Despite the fact that the price of Fe-SMA is currently higher than conventional structural steel, the whole-life costing of Fe-SMA-based applications may be comparable with the conventional technologies. It is noted that Fe-SMA is much cheaper than NiTi SMA which is often criticized for its high cost [ 153 , 154 , 155 , 156 , 157 ]. Existing studies also found that the total costs of Fe-SMA- and CFRP-based strengthening solutions are comparable when the cost of dedicated mechanical clamps for prestressing CFRP strips as well as the cost of labor were considered [ 141 ].…”

Section: Research and Potential Engineering Applicationsmentioning

confidence: 99%

Iron-Based Shape Memory Alloys in Construction: Research, Applications and Opportunities

Zhang

et al. 2022

Materials

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As a promising candidate in the construction industry, iron-based shape memory alloy (Fe-SMA) has attracted lots of attention in the engineering and metallography communities because of its foreseeable benefits including corrosion resistance, shape recovery capability, excellent plastic deformability, and outstanding fatigue resistance. Pilot applications have proved the feasibility of Fe-SMA as a highly efficient functional material in the construction sector. This paper provides a review of recent developments in research and design practice related to Fe-SMA. The basic mechanical properties are presented and compared with conventional structural steel, and some necessary explanations are given on the metallographic transformation mechanism. Newly emerged applications, such as Fe-SMA-based prestressing/strengthening techniques and seismic-resistant components/devices, are discussed. It is believed that Fe-SMA offers a wide range of applications in the construction industry but there still remains problems to be addressed and areas to be further explored. Some research needs at material-level, component-level, and system-level are highlighted in this paper. With the systematic information provided, this paper not only benefits professionals and researchers who have been working in this area for a long time and wanting to gain an in-depth understanding of the state-of-the-art, but also helps enlighten a wider audience intending to get acquainted with this exciting topic.

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Section: Research and Potential Engineering Applicationsmentioning

confidence: 99%

Iron-Based Shape Memory Alloys in Construction: Research, Applications and Opportunities

Zhang

et al. 2022

Materials

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“…In particular, the SMA-based SCB recently developed by the authors and co-workers 27 is selected for the bracing system, as shown in Figure 6A. The SCB incorporates post-tension (PT) SMA cables to provide the SC property and extra energy Figure 6B illustrates the idealized hysteretic behavior of the SCB, where a symmetric behavior of the brace is typically achieved in either tension or compression during the cyclic loading.…”

Section: Building Informationmentioning

confidence: 99%

Probabilistic seismic evaluation of SMA‐based self‐centering braced structures considering uncertainty of regional temperature

Chen

Wang

Fang

2021

Earthq Engng Struct Dyn

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Smart materials such as shape memory alloys (SMAs) have unique material properties that can potentially mitigate structural damage against earthquake. However, the mechanical behavior of SMAs is sensitive to temperature variation. The traditional deterministic analysis, which does not take into account the influence of temperature, may lead to inaccurate and sometimes unsafe predictions of actual behavior of SMA‐based structures. This research aims to develop a modified framework based on the performance‐based earthquake engineering methodology, taking account of the uncertainty of regional temperature distribution for temperature‐dependent (TD) structures, where the SMA‐based one is considered as a representative case. As the main part of the methodology, regional seismic fragility is generated by combing temperature distribution properties and joint seismic fragility. The proposed methodology is applied to a six‐story self‐centering concentrically‐braced frame (SC‐CBF) with SMA‐based SC braces located in different regions in China. A simplified thermo‐mechanical model capturing the TD characteristics and possible failure of SMA cables is utilized. Deterministic nonlinear static and dynamic analysis is first conducted to understand the structural response. Then, the joint seismic fragility analysis of the SC‐CBF under different intensity levels of ground motion and temperatures is conducted via the incremental dynamic analysis method, by which the seismic performance of the structure can be fully captured. Finally, the proposed methodology is utilized to comprehensively evaluate the regional seismic fragility and collapse risk of the SC‐CBF in different regions. The results indicate that the ignorance of the temperature effect could underestimate the risk of collapse.

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“…Other researchers have employed shape memory alloys (SMAs) to provide significantly increased deformation capacity and extra energy dissipation thanks to the superelastic effect, 24–33 although the temperature dependency and cost issues need to be carefully addressed. A recent study conducted by Chen et al 34 found that anchor slippage was the main failure mode for SCBs with SMA tendons.…”

Section: Introductionmentioning

confidence: 99%

Seismic robustness of self‐centering braced frames suffering tendon failure

Ping

Fang

Chen

et al. 2021

Earthq Engng Struct Dyn

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This paper comprehensively discusses the behavior and failure risk of self‐centering braced frames suffering tendon fracture. The fundamental mechanism of tendon failure in self‐centering braces (SCBs) is first introduced, followed by the design and analysis of a series of prototype buildings with different tendon materials and brace configurations. Assuming a normal distribution of tendon fracture strain, the dynamic behavior of the frames is then assessed by a suite of ground motion records, covering both far‐field and near‐fault ones. The collapse and residual deformation fragilities of the frames are further evaluated, and the study ends with a risk assessment considering a 50‐year service period. Among other findings, the study indicates that tendon fracture tends to increase the peak interstory drift, especially for the structure with smaller tendon fracture strains. Tendon fracture also compromises the self‐centering capability significantly, although there is no obvious statistical correlation between tendon fracture and the peak floor acceleration. The probability of collapse and that of exceedance of certain residual drift both increase evidently when tendon fracture is considered. The failure probabilities are closely related to the available deformability of the SCBs, where dual‐core SCBs show less sensitivity to tendon fracture. The probability of collapse of the considered frames over 50 years of service increases from 1.25‐2.12% to 3.58‐6.52% when tendon fracture is considered. Considering a residual drift threshold of 0.5%, the probability of exceedance of the same structures over the same life span increases from 1.78‐3.54% to 5.46‐9.71%.

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Variable-friction self-centering energy-dissipation braces (VF-SCEDBs) with NiTi SMA cables for seismic resilience

Cited by 72 publications

References 37 publications

Iron-Based Shape Memory Alloys in Construction: Research, Applications and Opportunities

Iron-Based Shape Memory Alloys in Construction: Research, Applications and Opportunities

Probabilistic seismic evaluation of SMA‐based self‐centering braced structures considering uncertainty of regional temperature

Seismic robustness of self‐centering braced frames suffering tendon failure

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