Effect of Loading Rate and Initial Strain on Seismic Performance of an Innovative Self-Centering SMA Brace
In order to improve the energy dissipation capacity and to reduce the residual deformation of civil structures simultaneously, this paper puts forwards an innovative self-centering shape memory alloy (SMA) brace that is based on the design concepts of SMA’s superelasticity and low friction slip. Sev...
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| Format: | Article |
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MDPI AG
2022-02-01
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| author | Yigang Jia Bo Zhang Sizhi Zeng Fenghua Tang Shujun Hu Wenping Chen |
| author_facet | Yigang Jia Bo Zhang Sizhi Zeng Fenghua Tang Shujun Hu Wenping Chen |
| author_sort | Yigang Jia |
| collection | DOAJ |
| description | In order to improve the energy dissipation capacity and to reduce the residual deformation of civil structures simultaneously, this paper puts forwards an innovative self-centering shape memory alloy (SMA) brace that is based on the design concepts of SMA’s superelasticity and low friction slip. Seven self-centering SMA brace specimens were tested under cyclic loading, and the hysteresis curves, bond curves, secant stiffness, energy dissipation coefficient, equivalent damping coefficient, and the self-centering capacity ratio of these specimens were investigated, allowing us to provide an evaluation of the effects of the loading rate and initial strain on the seismic performance. The test results show that the self-centering SMA braces have an excellent energy dissipation capacity, bearing capacity, and self-centering capacity, while the steel plates remain elastic, and the SMA in the specimens that are always under tension are able to return to the initial state. The hysteresis curves of all of the specimens are idealized as a flag shape with low residual deformation, and the self-centering capacity ratio reached 89.38%. In addition, both the loading rate and the initial strain were shown to have a great influence on the seismic performance of the self-centering SMA brace. The improved numerical models combined with the Graesser model and Bouc–Wen model in MATLAB were used to simulate the seismic performance of the proposed braces with different loading rates and initial strains, and the numerical results are consistent with the test results under the same conditions, meaning that they can accurately predict the seismic performance of the self-centering SMA brace proposed here. |
| first_indexed | 2024-03-09T23:34:38Z |
| format | Article |
| id | doaj.art-f1992f21e274446cb93f84d87abd338e |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T23:34:38Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-f1992f21e274446cb93f84d87abd338e2023-11-23T17:04:36ZengMDPI AGMaterials1996-19442022-02-01153123410.3390/ma15031234Effect of Loading Rate and Initial Strain on Seismic Performance of an Innovative Self-Centering SMA BraceYigang Jia0Bo Zhang1Sizhi Zeng2Fenghua Tang3Shujun Hu4Wenping Chen5School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, ChinaSchool of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, ChinaSchool of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, ChinaSchool of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, ChinaSchool of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, ChinaJiangxi Huaye Special Engineering Technology Co., Ltd., Nanchang 330001, ChinaIn order to improve the energy dissipation capacity and to reduce the residual deformation of civil structures simultaneously, this paper puts forwards an innovative self-centering shape memory alloy (SMA) brace that is based on the design concepts of SMA’s superelasticity and low friction slip. Seven self-centering SMA brace specimens were tested under cyclic loading, and the hysteresis curves, bond curves, secant stiffness, energy dissipation coefficient, equivalent damping coefficient, and the self-centering capacity ratio of these specimens were investigated, allowing us to provide an evaluation of the effects of the loading rate and initial strain on the seismic performance. The test results show that the self-centering SMA braces have an excellent energy dissipation capacity, bearing capacity, and self-centering capacity, while the steel plates remain elastic, and the SMA in the specimens that are always under tension are able to return to the initial state. The hysteresis curves of all of the specimens are idealized as a flag shape with low residual deformation, and the self-centering capacity ratio reached 89.38%. In addition, both the loading rate and the initial strain were shown to have a great influence on the seismic performance of the self-centering SMA brace. The improved numerical models combined with the Graesser model and Bouc–Wen model in MATLAB were used to simulate the seismic performance of the proposed braces with different loading rates and initial strains, and the numerical results are consistent with the test results under the same conditions, meaning that they can accurately predict the seismic performance of the self-centering SMA brace proposed here.https://www.mdpi.com/1996-1944/15/3/1234shape memory alloy (SMA)self-centering SMA braceloading rateinitial strainenergy dissipation coefficient |
| spellingShingle | Yigang Jia Bo Zhang Sizhi Zeng Fenghua Tang Shujun Hu Wenping Chen Effect of Loading Rate and Initial Strain on Seismic Performance of an Innovative Self-Centering SMA Brace Materials shape memory alloy (SMA) self-centering SMA brace loading rate initial strain energy dissipation coefficient |
| title | Effect of Loading Rate and Initial Strain on Seismic Performance of an Innovative Self-Centering SMA Brace |
| title_full | Effect of Loading Rate and Initial Strain on Seismic Performance of an Innovative Self-Centering SMA Brace |
| title_fullStr | Effect of Loading Rate and Initial Strain on Seismic Performance of an Innovative Self-Centering SMA Brace |
| title_full_unstemmed | Effect of Loading Rate and Initial Strain on Seismic Performance of an Innovative Self-Centering SMA Brace |
| title_short | Effect of Loading Rate and Initial Strain on Seismic Performance of an Innovative Self-Centering SMA Brace |
| title_sort | effect of loading rate and initial strain on seismic performance of an innovative self centering sma brace |
| topic | shape memory alloy (SMA) self-centering SMA brace loading rate initial strain energy dissipation coefficient |
| url | https://www.mdpi.com/1996-1944/15/3/1234 |
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