Incremental dynamic analyses of concrete buildings reinforced with shape memory alloy

Mirtaheri, Masoud; Amini, Mehrshad; Khorshidi, Hossein

doi:10.12989/scs.2017.23.1.095

Cited by 8 publications

(3 citation statements)

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“…Mirtaheri et al. 15 investigated the numerical behavior of multi-story RC frames reinforced with SMAs. The results showed that by increasing the height of frames the frame fragility increases.…”

Section: Introductionmentioning

confidence: 99%

The cyclic response of circular reinforced concrete column to foundation connections strengthened with shape memory alloy bars

Miralami

Esfahani

Tavakkolizadeh

et al. 2020

Journal of Composite Materials

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This study presents a new method for strengthening the circular reinforced concrete (RC) column to foundation connections with shape memory alloy (SMA) bars and carbon fiber reinforced polymer (CFRP) sheets. In the experimental part of the study, three specimens of RC column-foundation connections were cast and tested. One specimen was used as the reference specimen without strengthening. Two other specimens were strengthened with longitudinal SMA bars and CFRP sheets. These specimens were under a constant axial compressive load and cyclic lateral displacements, simultaneously. Next, initial stiffness, energy dissipation capacity, lateral load capacity, ductility, and residual displacement of the specimens were investigated. Due to the superelastic behavior of SMA bars, the residual displacement of column-foundation connections was considerably less than that of the reference specimen. Compared to the reference specimen, the SMA-strengthened and SMA-CFRP-strengthened connections recovered 71.59% and 76.57% of the residual displacement. Therefore, SMA bars were able to recover residual displacements under cyclic loading. Also, the combination of the SMA bars with CFRP sheet was a promising solution for enhancing the amount of the energy dissipation, lateral load capacity, initial stiffness, and ductility parameters. Compared to the reference specimen, the energy dissipation, lateral load capacity, initial stiffness, and ductility ratio parameters of SMA-CFRP-strengthened connection increased about 43.45%, 76.20%, 81.69%, and 242.45%, respectively. In the numerical part of the study, a subroutine was applied for modeling the SMA materials. For the analysis, this subroutine was linked with ABAQUS software. The numerical results showed a close correlation with the experimental results.

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Section: Introductionmentioning

confidence: 99%

The cyclic response of circular reinforced concrete column to foundation connections strengthened with shape memory alloy bars

Miralami

Esfahani

Tavakkolizadeh

et al. 2020

Journal of Composite Materials

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“…Ma and Cho (2008) presented a re-centering SMA damper which consists of two groups of SMA wires and two springs, functioning as energy dissipating and re-centering groups, respectively, and the numerical simulation results showed that the SMA damper could reduce the residual deformation of the structure effectively. SMA was also applied to cross-bracing cables (McCormick et al, 2007), fiber reinforced polymer (FRP) composite reinforcements (Wierschem and Andrawes, 2010), RC beam–column joints (2011), BRBs (Miller et al, 2012), bridge cables (Torra et al, 2014), passive control devices (Han et al, 2006; Jalaeefar and Asgarian, 2014), motion control devices (Nakshatharan et al, 2014), seismic isolators (Ozbulut and Silwal, 2016), steel re-bars (Mirtaheri et al, 2017), and retrofit of structures (Rameshwar, 2014). These studies show that utilizing SMA can improve the seismic performance of structures by providing the re-centering capability.…”

Section: Introductionmentioning

confidence: 99%

Life-cycle cost evaluation of steel structures retrofitted with steel slit damper and shape memory alloy–based hybrid damper

Noureldin

Naeem

Kim

2018

Advances in Structural Engineering

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In this study, the seismic capacity of a hybrid damper, composed of a steel slit plate damper and two shape memory alloy bars, is investigated through fragility analysis and life-cycle cost evaluation of a steel frame retrofitted with the damper. The nonlinear time history analysis model frames show that the seismic responses of the frames equipped with hybrid damper are significantly lesser than the frames retrofitted with conventional slit dampers. The enhancement in the seismic performance of frames retrofitted with hybrid damper is because of extra stiffness, energy dissipation, and self-centering capability provided by the shape memory alloy bars. It is also observed that the life-cycle cost of the frames equipped with hybrid dampers is smallest compared with the life-cycle cost of the bare frames and the frames equipped with slit dampers, even though the initial cost is of the hybrid damper is higher than that of the conventional slit damper.

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“…Seismic fragility of nonlinear connections in large piping systems has been evaluated by Tadinada and Gupta [22]. Seismic fragility of RC structures with shape memory alloys has been investigated by Mirtaheri et al [23]. Finally, the results of additive dynamic analysis were used for generating the fragility curves.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Seismic Vulnerability of Steel and RC Moment Buildings Using HAZUS and Statistical Methodologies

Mansouri¹,

Hu²,

Shakeri³

et al. 2017

Discrete Dynamics in Nature and Society

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Designer engineers have always the serious challenge regarding the choice of the kind of structures to use in the areas with significant seismic activities. Development of fragility curve provides an opportunity for designers to select a structure that will have the least fragility. This paper presents an investigation into the seismic vulnerability of both steel and reinforced concrete (RC) moment frames using fragility curves obtained by HAZUS and statistical methodologies. Fragility curves are employed for several probability parameters. Fragility curves are used to assess several probability parameters. Furthermore, it examines whether the probability of the exceedence of the damage limit state is reduced as expected. Nonlinear dynamic analyses of five-, eight-, and twelve-story frames are carried out using Perform 3D. The definition of damage states is based on the descriptions provided by HAZUS, which gives the limit states and the associated interstory drift limits for structures. The fragility curves show that the HAZUS procedure reduces probability of damage, and this reduction is higher for RC frames. Generally, the RC frames have higher fragility compared to steel frames.

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Incremental dynamic analyses of concrete buildings reinforced with shape memory alloy

Cited by 8 publications

References 0 publications

The cyclic response of circular reinforced concrete column to foundation connections strengthened with shape memory alloy bars

The cyclic response of circular reinforced concrete column to foundation connections strengthened with shape memory alloy bars

Life-cycle cost evaluation of steel structures retrofitted with steel slit damper and shape memory alloy–based hybrid damper

Assessment of Seismic Vulnerability of Steel and RC Moment Buildings Using HAZUS and Statistical Methodologies

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