Feasibility study of utilizing superelastic shape memory alloy plates in steel beam–column connections for improved seismic performance

Moradi, Saber; Alam, M. Shahria

doi:10.1177/1045389x14529032

Cited by 67 publications

(37 citation statements)

References 43 publications

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“…The Recentering ability of the superelastic SMA connection refer to the amount of residual rotation in the connection. It can be calculated as the difference between a maximum drift and the residual drift then divided by the maximum drift [21]. The response of two story steel building is studied for earthquake acceleration using time history analysis with Vrancea earthquake data [20].…”

Section: Recentering Ability and Story Driftmentioning

confidence: 99%

Seismic Performance of Two Story Steel Building Using Shape Memory Alloys (SMAs) Bars

Hameed

Abbas

2019

Civ Eng J

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Shape Memory Alloys (SMA) is type of smart materials that have ability to undergo large deformation and return back to their undeformed shape through heating (shape memory effect) or removal of load (superelastic effect). This unique ability is useful to enhance behavior of structure and seismic resistance. In this paper, superelasticity (SE) effect of NiTi alloys is used to improve the structural characteristics of steel building. The finite element analysis of steel building is done using ABAQUS v.2017. In order to compare the structural behavior of the steel building equipped with Shape Memory Alloy bars at beam-column connection, three steel building was modeled with a different combination of high strength steel bars and SMA bars. The steel building was checked for time history analysis by using Vrancea 1977 earthquake data. In order to estimate the recentring ability, residual of roof displacement and energy dissipation. The steel building equipped with SMA bars shows 82.7%, 152.72% recovery in residual roof displacement for steel building equipped with 50% SMA bars and 50% HS steel bars and steel building equipped with 100% SMA bars respectively, and moderate energy dissipation. In general, the frame equipped with 50% superelastic SMA bars and 50% HS steel bars provided better seismic performance.

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Section: Recentering Ability and Story Driftmentioning

confidence: 99%

Seismic Performance of Two Story Steel Building Using Shape Memory Alloys (SMAs) Bars

Hameed

Abbas

2019

Civ Eng J

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“…Conversely, the SE is easily detected at the austenite phase, which is stable at a high temperature. The SME can be described as a material's ability to regain its original shape upon heating while the SE describes a material's distinct capability to recover its original configuration from large deformation just after the removal of the applied load [22][23][24]. As can be seen in Figure 1, SMA materials exhibit the SME under the temperature below the martensite finishing temperature (Mf).…”

Section: Superelastic Sma Materialsmentioning

confidence: 99%

Pilot Study for Investigating the Cyclic Behavior of Slit Damper Systems with Recentering Shape Memory Alloy (SMA) Bending Bars Used for Seismic Restrainers

Seo

Kim

2015

Applied Sciences

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Although the steel slit dampers commonly utilized for aseismic design approach can dissipate considerable energy created by the yielding of base materials, large residual deformation may happen in the entire frame structure. After strong external excitation, repair costs will be incurred in restoring a structure to its original condition and to replace broken components. For this reason, alternative recentering devices characterized by smart structures, which mitigate the damage for such steel energy dissipation slit dampers, are developed in this study. These devices, feasibly functioning as seismic restrainers, can be improved by implementing superelastic shape memory alloy (SMA) bending bars in a parallel motion with the steel energy-dissipating damper. The bending bars fabricated with superelastic SMAs provide self-centering forces upon unloading, and accordingly contribute to reducing permanent deformation in the integrated slit damper system. The steel slit dampers combined with the superelastic SMA bending bars are evaluated with respect to inelastic behavior as simulated by refined finite element (FE) analyses. The FE slit damper models subjected to cyclic loads are calibrated to existing test results in an effort to predict behavior accurately. The responses of the proposed slit damper systems are compared to OPEN ACCESSAppl. Sci. 2015, 5 188 those of the conventionally used slit damper systems. From the analysis results, it is concluded that innovative steel slit dampers combined with superelastic SMA bending bars generate remarkable performance improvements in terms of post-yield strength, energy dissipation, and recentering capability.

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“…Several selfcentering systems have been previously investigated for steel buildings, using different mechanisms for energy dissipation and self-centering capability. Examples of these self-centering systems are steel buildings with shape memory alloy (SMA) bracing [14][15][16] and SMA-based connections [17][18][19], self-centering energy dissipative braces [20][21][22], rocking systems [23][24][25], and steel plate shear walls [26,27]. Another approach to self-centering is to use post-tensioned (PT) elements in steel moment resisting frames [28].…”

Section: Introductionmentioning

confidence: 99%

Cyclic response sensitivity of post-tensioned steel connections using sequential fractional factorial design

Moradi

Alam

Milani

2015

Journal of Constructional Steel Research

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Feasibility study of utilizing superelastic shape memory alloy plates in steel beam–column connections for improved seismic performance

Cited by 67 publications

References 43 publications

Seismic Performance of Two Story Steel Building Using Shape Memory Alloys (SMAs) Bars

Seismic Performance of Two Story Steel Building Using Shape Memory Alloys (SMAs) Bars

Pilot Study for Investigating the Cyclic Behavior of Slit Damper Systems with Recentering Shape Memory Alloy (SMA) Bending Bars Used for Seismic Restrainers

Cyclic response sensitivity of post-tensioned steel connections using sequential fractional factorial design

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