Enhancing the seismic performance of historic timber buildings in Asia by applying super-elastic alloy to a Chinese complex bracket system

Xie, Wenjun; Araki, Yoshikazu; Chang, Wen‐Shao

doi:10.1080/15583058.2018.1442528

Cited by 11 publications

(4 citation statements)

References 18 publications

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“…To enhance the damping ratio under heating, the SMA can be installed in a pre-strained form. In our previous studies [35,42], experiments showed that pre-strained SMAs can significantly increase the damping ratio. This solution ensures the SMA has sufficient damping.…”

Section: Discussion and Future Extensionsmentioning

confidence: 92%

“…By contrast, under such a large deformation it is easy for traditional construction material such as steel to have a residual deformation. This could have a substantial effect on its stress-strain relationship and reduce its fatigue life [35]. Another advantage of SMA-based TMD is that it is mechanically simple.…”

Section: Figure 1 Idealisation Of the Application Of Tmd System To A Structurementioning

confidence: 99%

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Adaptive tuned mass damper with shape memory alloy for seismic application

Huang

Mosalam

Chang

2020

Engineering Structures

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When the characteristics of the main structure are changed, tuned mass damper (TMD) is easy to meet off-tuning problem. The object of this study is to develop a TMD with shape memory alloy (SMA) to reduce the vibration caused by off-tuning under seismic excitations. By materials characterisation of SMA, when the working temperature rises from -40℃ to 65℃, the stiffness increases and the equivalent damping ratio drops. The SMA-based TMD was installed on a steel frame and tested under earthquake loading. The results show the SMA-based TMD is able to reduce the seismic response in the range of 34.09% to 47.77% at the tuned condition. However, by changing the main structural mass, the TMD was easy to be off-tuned. To retune the TMD, the SMA was heated and cooled for the TMD to resonate with the natural frequency of the main structure. When the SMA is cooled, the peak and RMS accelerations can be effectively reduced by up to 23.98% and 35.51%, respectively. It was found that the SMA-based TMD performs well if the frequency change of the main structure is in the same order. But when the temperature of SMA is increased higher than 19℃, the damping ratio of SMA decreases, which causes a less effectiveness in reducing the vibration. In the future, the combinations of multiple SMA bars in TMD should be studied, and the applications of SMAs with higher phase transformation temperature can be investigated to improve the sensitivity while heating.

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Section: Discussion and Future Extensionsmentioning

confidence: 92%

Section: Figure 1 Idealisation Of the Application Of Tmd System To A Structurementioning

confidence: 99%

Adaptive tuned mass damper with shape memory alloy for seismic application

Huang

Mosalam

Chang

2020

Engineering Structures

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“…These timber buildings have diverse connection systems, such as dovetail connections (Chang & Hsu, 2005) and Dou-Gong system. The anti-seismic performance of historic timber buildings has been extensively studied over the past 20 years (Fang et al, 2001a;Fang et al, 2001b;Fujita, Hanazato & Sakamoto, 2004;Chang, 2005;Suzuki & Maeno, 2006;Chang, Hsu & Komatsu, 2006;Chang & Hsu, 2007;Yu et al, 2008;Chang et al, 2009;Xue et al, 2015;Yeo et al, 2018;Xie, Araki & Chang, 2018), and it has been recognised that Dou-Gong systems in historic timber buildings play an important role in resisting seismic action. Dou-Gong systems are located at the top of columns to support upper structures and transmit the weight of both the structures and the roof to the columns and the foundations.…”

Section: Introductionmentioning

confidence: 99%

“…A simple technique has been developed whereby metal bars are used to replace the conventional wooden peg connections to enhance the seismic performance of base Dou. It achieves this by maintaining base Dou's original re-centring capability and increasing both its energy dissipation capacity and its ultimate strength (Xie, Araki & Chang, 2018). Tests were conducted with conventional wooden peg connections and two metal connections (high strength steel and super-elastic alloy).…”

Section: Introductionmentioning

confidence: 99%

Static behaviour of a two-tiered Dou-Gong system reinforced by super-elastic alloy

Xie

Wang

Chang

2019

Proceedings of the Institution of Civil Engineers - Engineering

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The Dou-Gong system in Asian timber structures plays an important role in resisting seismic action. Traditional carpentry in Asia uses timber pegs to connect components, which enables relative movement between components and hence provides friction to dissipate energy in an earthquake. This method, however, has some shortcomings, such as inadequate stiffness to resist a large lateral force, and, therefore, the structures tend to exhibit permanent deformation after earthquakes. This study proposes a new technique by using super-elastic alloy bars to replace conventional wooden peg connections to enhance the seismic performance of the structures. Static pushover experiments were conducted on full-scale two-tiered Dou-Gong systems, and high-strength steel and conventional wooden pegs were used as benchmarks. The ultimate stiffness of the Dou-Gong system has shown an increase when both high-strength steel and super-elastic alloy bars were used, but only super-elastic alloy can provide a consistently high damping ratio. This technique also involves pre-strain of the super-elastic alloy, and the outcomes of this series of experiments have shown that pre-strain of the super-elastic alloy can significantly increase the damping ratio in the structure, and, hence, more energy is dissipated. The results of this paper can be used in projects of timber structures using the Dou-Gong system.

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