Seismic performance analysis of multi-story steel frames equipped with FeSMA BRBs

Qiu, Canxing; Zhang, Ai-Fang; Jiang, Tianyuan; Du, Xiuli

doi:10.1016/j.soildyn.2022.107392

Cited by 28 publications

(8 citation statements)

References 37 publications

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“…Figure 14 presents the mean results of ductility under the ground motion suite over the considered period range. In the short period range, µ is very large, which has been observed by many prior studies [44,45]. According to definition, the µ value for T = 0 s is a function of R, i.e.…”

Section: Effect Of Fundamental Periodmentioning

confidence: 72%

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Seismic displacement response of SDOF systems with SMA slip friction dampers

Qiu,

Bai,

Jiang

2023

Smart Mater. Struct.

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Owing to superelastic behavior, shape memory alloy (SMA) has been widely utilized to develop self-centering damping devices. Recently, the authors developed a novel SMA damper, i.e. the SMA slip friction (SMASF) damper. The cyclic behavior of the SMASF damper not only depends on the hysteresis shape factors of SMA bars, but also on the coefficient of kinetic friction and the slope of the friction plates. Hence, the basic working mechanism of the SMASF damper is different from that of conventional SMA dampers. In the early work, the features of the SMASF damper have been revealed by static cyclic loading tests. However, the seismic displacement responses of this novel damper remain unknown. To this end, this paper initiates with a brief introduction of the damper, including the configuration, working mechanism, and testing results. And then, extensive seismic analyses based on single-degree-of-freedom systems were conducted. Based on the constant-strength ductility demand spectra, the displacement responses of the SMASF damper were understood through the comparisons with conventional SMA damper and friction damper. A wide range of fundamental periods, strength capacities and seismic intensity levels were considered. Further, parametric analysis was conducted to assess the effect of the hysteresis shape factors of SMA bars and the coefficient of kinetic friction and the slope of the friction plates. This study also sheds light on the force-based seismic design method for this damper.

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Section: Effect Of Fundamental Periodmentioning

confidence: 72%

“…Table 1 lists the range of the considered parameters. The upper limits of α s and β s are defined based on experimental data [14,47] and parametric analyses [41,45]. The upper limit of µ f is capped by 0.15 to ensure the SC function, and the upper limit of θ f is capped by 45 • to reduce the deformation demand of the SMA bars.…”

Section: Parametric Analysismentioning

confidence: 99%

Seismic displacement response of SDOF systems with SMA slip friction dampers

Qiu,

Bai,

Jiang

2023

Smart Mater. Struct.

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“…Afterwards, this index keeps decreasing with the loading amplitude, due to the nonlinear behavior of the yielding core. The post-yield stiffness ratio affects the drift concentration degree and residual deformations, as discussed in [13,29,42]. Due to the combined kinematic and isotropic hardening behavior, the post-yield stiffness decreases with the increase of loading amplitude as illustrated in figure 9(b).…”

Section: Secant Stiffness and Post-yield Stiffness Ratiomentioning

confidence: 96%

“…Representatives of FeSMA dampers include the BRBs [25,26], shear damper [27] and U-shaped damper [28]. More recently, a comparative analysis demonstrated that, owing to the larger post-yield stiffness ratio, FeSMA BRBs could better control residual deformations than conventional steel BRBs [29].…”

Section: Introductionmentioning

confidence: 99%

Experimental tests and numerical simulations of miniature buckling-restrained braces using iron-shape memory alloy bar

Wang,

Jiang,

Qiu

et al. 2024

Smart Mater. Struct.

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Miniature buckling-restrained braces (BRBs) have a concise configuration and clear working mechanism. Owing to stable and full hysteresis, miniature BRBs are emerging as favorable energy-dissipating fuse elements in seismic applications. This paper proposes using iron-shape memory alloy (FeSMA) in lieu of conventional steel as the yielding core and focuses on the cyclic behavior. Four specimens, corresponding to four loading protocols, were fabricated and tested. According to experimental data, the miniature FeSMA BRBs exhibited full hysteresis, which is characterized by large damping, noticeable isotropic and kinematic hardening behavior and appreciable post-yield stiffness ratio. The cumulative plastic deformations meet the requirement by ANSI/AISC 341-16. Further, high fidelity finite element models, which explicitly considered damage and fracture rules, were established for numerical simulations. Good agreement can be found between the experimental data and numerical simulations, in terms of failure modes, fracture locations and global hysteresis.

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“…These systems employ structural fuses, defined as 28 the members which primarily dissipate the energy of seismic vibration. Among all available 29 alternatives [1][2][3], Linked-Column Frame (LCF) has been proven to be an economic system 30 whose link beams can be easily replaced in its specific performance level of Rapid Return to 31 Occupancy (RRO) (Figure 1a). LCF consists of Linked Column (LC) and a secondary Moment 32 Frame (MF) with detailing connections the same as the intermediate moment frame due to low 33 demands on gravity structure [4] (Figure 1b).…”

Section: Introduction 26mentioning

confidence: 99%

Seismic Performance of Linked-Column Frame; Multi-Parameter Study

Jaya

2023

Preprint

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In the current research, the effect of length and number of link beams on the structural response of Linked-Column Frames (LCFs) with different heights has been studied and compared with Special Moment-Resisting Frames (SMRFs). To this aim, 34 LCFs of 3-, 6-, and 9-story with two or three links in story level were designed in ETABS and simulated in OpenSees. The beam length ranged between 1-3.5 m altering plastic behavior from shear to flexure. Nonlinear dynamic analysis was carried out using 20 numbers of far-field and near-field records from FEMA-P695 scaled to DBE and MCE seismic hazard levels. Results illustrated that increasing the length and number of links generally reduced seismic demands. However, conflicting trends were observed in shear-flexure cases producing the greatest drift ratio and lowest base shear at the same time. Also, near-field records maintained almost similar demands compared to the far-field set except for the significantly different base shear responses. The results of 3-story LCFs were more promising in terms of a larger reduction in demands compared to the same height SMRF; utilizing LCF reduced SMRF drift ratio up to 72% in 3-story, and almost 26% in 6- and 9-story structures. The desirability coefficient determined the most suitable configuration for link beams, suggesting three numbers of 1.5 m shear links for 3-story LCF, and 3 m intermediate links with 3 and 2 numbers for 6- and 9-story structures, respectively. In conclusion, LCF system is not economical for taller buildings due to the relative weight increase.

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Seismic performance analysis of multi-story steel frames equipped with FeSMA BRBs

Cited by 28 publications

References 37 publications

Seismic displacement response of SDOF systems with SMA slip friction dampers

Seismic displacement response of SDOF systems with SMA slip friction dampers

Experimental tests and numerical simulations of miniature buckling-restrained braces using iron-shape memory alloy bar

Seismic Performance of Linked-Column Frame; Multi-Parameter Study

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