Seismic performance evaluation and design of resilient knee braced frames equipped with shape memory alloy knee braces and replaceable energy-dissipating connections

Qiu, Canxing; Jiang, Tianyuan; Peng, Lingyun; Liu, Jiawang; Du, Xiuli

doi:10.1016/j.engstruct.2023.115918

Cited by 11 publications

(1 citation statement)

References 33 publications

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“…For example, aluminum bar was used in lieu of steel bar to address the corrosion problem [10] and mild steel was used to improve the ductility capacity and fatigue life [11]. Through exploring the superelastic nature of NiTi shape memory alloy (SMA) [12][13][14], the community proposed the NiTi-based BRB dampers and experimentally confirmed the excellent capacity of recovering large nonlinear deformation [15], derived the analytical equations of the buckling mode [16], conducted seismic performance evaluation [17] and established the seismic design method [18].…”

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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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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High‐Performance SMA–Based Self‐Centring Precast Segmental Concrete Column: Design Concept, Test and Simulation

Chen,

Zhang,

Huang

et al. 2024

Earthq Engng Struct Dyn

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This paper presents an experimental study of a novel high‐performance self‐centring (SC) precast segmental concrete column (PSCC) utilising shape memory alloy (SMA) bolts. The tested PSCC was constructed with four precast concrete segments and had a total height of 1555 mm. The whole column was assembled by connecting four segments through bolts solely, without using any complex anchorage for posttensioned components. Four 20‐mm‐diameter SMA bolts were used at the column base, whilst other segments were connected using high‐strength steel bolts. Certain levels of prestrain were applied in the SMA and steel bolts when assembling, causing some minor initial cracks around the segment corners due to the casting imperfection and small gaps between the segments; however, no further crack development was observed after achieving stability. A series of cyclic and monotonic quasi‐static tests were conducted to examine the working mechanism, structural behaviour, reusability, ductility and failure mode. Two cyclic horizontal loadings corresponding to a maximum drift ratio of 5% were applied consecutively, wherein the SMA bolts were retightened by hand in between. The SMA‐SC‐PSCC showed desirable flag‐shaped behaviour under both loadings, with only some minor damages found on the concrete segments. Then, a monotonic loading was applied until the failure of the specimen, and the bottom segment fractured at a displacement of 86 mm (corresponding to 5.8% drift ratio). After the tests, a refined finite element model simulation was conducted as complementation. The satisfactory performance of the SC‐PSCC showed that by using SMA bolts, the high‐performance, low‐damage and easy‐construction design can be achieved simultaneously. The experimental and numerical results provided a promising design alternative in modern earthquake‐resilient civil infrastructure.

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An innovative two-level yielding knee-braced frame with deformation-controlled ring damper

Eghlimi,

Memarzadeh,

Abadi

et al. 2024

Case Studies in Construction Materials

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Seismic performance evaluation and design of resilient knee braced frames equipped with shape memory alloy knee braces and replaceable energy-dissipating connections

Cited by 11 publications

References 33 publications

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

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

High‐Performance SMA–Based Self‐Centring Precast Segmental Concrete Column: Design Concept, Test and Simulation

An innovative two-level yielding knee-braced frame with deformation-controlled ring damper

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