Analytical investigation of the behavior of a new smart recentering shear damper under cyclic loading

Mirzai, Nadia M.; Attarnejad, Reza; Hu, Jong Wan

doi:10.1177/1045389x19888786

Cited by 15 publications

(7 citation statements)

References 37 publications

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“…In this damper, three effective parts of the damper, including SMA plates, friction devices, and polyurethane springs, perform in parallel. Therefore, according to the parallel formulation, displacement is identical in all the components, but component forces are summed 32 . Figure 4a shows the behavior of the SMA plates.…”

Section: Response Mechanismmentioning

confidence: 99%

Experimental study of new axial recentering dampers equipped with shape memory alloy plates

Mirzai

Cho

2020

Struct Control Health Monit

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Summary The most important issues that researchers are faced with are extensive damages and permanent deformations in the structures after earthquakes. This study proposes new hybrid smart dampers combined with shape memory alloy (SMA) plates, friction devices, and polyurethane springs (e.g., ASFP damper) with an aim to decrease structural damage as well as to mitigate residual deformation in the concentrically braced frames (CBFs). These dampers are simply fabricated, and the other parts are low cost except for the nitinol SMA plates. In addition, they can be employed for not only new construction but also rehabilitation of existing structures. In order to investigate the behavior of each key component (e.g., SMA plates, friction devices, and polyurethane springs), eight different cases are experimentally investigated under quasi‐static cyclic loading, and the effects of all components are evaluated in this study. In four cases, the SMA plates are replaced by the steel plates to better understand the effect of SMA plates on recentering capability. The details of experimental tests are described with more details. The final results demonstrate that the SMA dampers can restore more than half of residual displacement. In addition, these SMA dampers exhibit stable energy dissipation and adequately operates under both compressive and tensile loading.

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Section: Response Mechanismmentioning

confidence: 99%

Experimental study of new axial recentering dampers equipped with shape memory alloy plates

Mirzai

Cho

2020

Struct Control Health Monit

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“…They can significantly enhance the comprehensive seismic capacity of high buildings. The replaceable property of the metal dampers can promote the rapid postearthquake recovery of building functions [1][2][3][4]. Traditional shear metal dampers are mainly used in high-rise or super-high-rise buildings and are not suitable for low multistory buildings because of their complex structure and high cost [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mechanical Properties of Shear Square Section Steel Tube Dampers

Hui

et al. 2022

Metals

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Based on the excellent performance of shear metal dampers in building seismic capacity, the traditional shear metal damper was optimized. A double-sided shear steel tube damper with simple structure, easy replacement, and wide application is proposed. In order to study the influence of different design parameters on its seismic performance, taking the steel tube length, height, width, thickness, and connection mode as variables, five groups of 15 specimens were designed for experimental research, and the failure modes, characteristic loads and displacements, hysteretic curves, skeleton curves, stiffness degradation curves, and energy dissipation capacity of each specimen were analyzed in detail. The test results showed that the hysteretic curves of each specimen were full and that the energy dissipation capacity was good. The greater the thickness of the steel tube was, the greater the load-bearing capacity of the damper and the larger the hysteresis loop area were. The greater the width of the steel tube was, the greater the equivalent stiffness was. As displacement amplitude increased, the equivalent stiffness of the specimen showed a downward trend. The two connection modes had their own advantages and disadvantages, and a damper with reasonable connection form would need to be selected according to actual engineering needs.

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“…Mirzai and Attarnejad proposed a new superelastic damper and used the proposed damper in the EBF frame. ey used time history analysis to investigate the SMA performance on the structure [43][44][45][46]. Aryan and Ghassemieh utilized this material in a multispan bridge and proposed an innovative superelastic system for retrofitting.…”

Section: Introductionmentioning

confidence: 99%

Analytical and Numerical Investigation of Knee Brace Equipped with a Shape Memory Alloy Damper

Shakiba

Mortazavi

2022

Shock and Vibration

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Shape memory alloys (SMAs) are some of the new materials that have attracted the attention of many engineers due to their unique behavior. The most important advantage of these materials is their superelastic behavior, which allows the alloy to return to its original shape after a large deformation. In superelastic behavior, the shape memory alloy can also dissipate a significant amount of energy while returning to its original shape. In this research, the superelastic alloy made of nitinol has been used to improve the performance of knee dampers. For this purpose, a frame equipped with a knee damper was selected as the reference model and was modelled in Abaqus numerical software and validated with an experimental model. After ensuring the correct behavior of the numerical model, the SMA damper was installed perpendicular to the knee damper, between the knee damper and the beam to column connection. In this paper, two parameters of the SMA damper cross section area and SMA length were investigated. Based on the observed results, increasing the length of SMA increases the system resistance. As the cross section area of the SMA damper increases, the effect of the SMA length on the resistance of the system increases. On the other hand, increasing the cross section area of the SMA significantly increases the recentering of the system. Due to the significant recentering that the SMA damper creates in the structure, the amount of energy dissipation of the system is reduced compared to the reference model. The amount of dissipated energy depends on the length and cross section area of the SMA damper. Thus, the longer the SMA, the greater the energy dissipation, and the lower the SMA cross section area, the lower the system energy dissipation.

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Analytical investigation of the behavior of a new smart recentering shear damper under cyclic loading

Cited by 15 publications

References 37 publications

Experimental study of new axial recentering dampers equipped with shape memory alloy plates

Experimental study of new axial recentering dampers equipped with shape memory alloy plates

Experimental Study on Mechanical Properties of Shear Square Section Steel Tube Dampers

Analytical and Numerical Investigation of Knee Brace Equipped with a Shape Memory Alloy Damper

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