Modeling of Buckling Restrained Braces (BRBs) using Full-Scale Experimental Data

Avci-Karatas, Cigdem; Celik, Oguz C.; Eruslu, S. Ozmen

doi:10.1007/s12205-019-2430-y

Cited by 26 publications

(6 citation statements)

References 22 publications

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“…Guo et al [12] and Cao et al [17] utilized a friction coefficient of 0.1 for the interaction between the steel core and concrete encasing. Avci-Karatas et al [16] used a friction coefficient of 0.03 for the interaction between the steel core and concrete encasing where a teflon pad was utilized. Chou and Chen [13]and Heidary-Torkamani et al [15]selected friction coefficient as 0.1 for the steel core and steel encasing where grease oil was utilized.…”

Section: Figure 1typical Buckling Restrained Bracementioning

confidence: 99%

“…Heidary-Torkamani et al [15] utilized a gap size of 6 mm between the tubed steel core and tubed steel encasing. [8] In the literature, limited studies [6,9,[12][13][14][15][16][17][18] are available on numerical modeling of BRBs. The reason for this can be attributed to the complexity of modeling interaction between the steel core and encasing, which leads to significant convergence problems and computational cost.…”

Section: Introductionmentioning

confidence: 99%

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The Effects of Steel Core Imperfection, Gap Size and Friction Coefficient on the Behavior of All-Steel Buckling Restrained Braces

Özkılıç

2021

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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Buckling restrained braces (BRBs) which are generally composed of a steel core and a encasing(buckling restrainers) are utilized to resist lateral forces in high seismic regions since BRBs exhibit high energy dissipation capacity, ductility and stiffness. The steel core carries both compressive and tensile forces. During the compression, the core starts buckling and the encasing tries to prevent this buckling. However, due to the unbonding layer/gap between the encasing and steel core, the steel core eventually buckles and contacts with the encasing. Buckling phenomenon is also associated with the initial imperfection and gap size. In this study, the effects of the initial imperfectionof steel core, gap size (1-5 mm)and friction coefficient (0.01-0.5)between the encasing and steel core on the behavior of BRBs are investigated. Pursuant to this goal, numerical analyses using a finite element tool ABAQUS were conducted. A total of 19 numerical models were developed and monotonically loaded. Initial imperfection was implemented to the models using buckling mode shapes.The results revealed that increasing gap size leads to a reduction in load-carrying capacity. It is recommended to keep gap sizes between 1 and 2 mm. On the other hand, initial imperfection does not significantly affect load-carrying capacity and global behavior. However, it was also observed that the fluctuations in load increase as the amplitude of the mode shape and gap size increase. Moreover, the friction coefficient should be kept between 0.01 and 0.05; otherwise, undesired behaviors can be observed.

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Section: Figure 1typical Buckling Restrained Bracementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effects of Steel Core Imperfection, Gap Size and Friction Coefficient on the Behavior of All-Steel Buckling Restrained Braces

Özkılıç

2021

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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“…The primary use case for the friction coefficient in BRBs is to numerically simulate the effects of higher-mode buckling of the core plate using nonlinear finite-element software, such as LS-Dyna, Abaqus, and Ansys. However, owing to a lack of direct friction data, current practice is to adopt a Coulomb friction model calibrated against peak BRB forces (Avci- Karatas et al 2019;Budaházy and Dunai 2015;Chen et al 2016;Guo et al 2017;Stratan et al 2020). These constant friction coefficients have varied from μ ¼ 0.03 to 0.5, but μ ¼ 0.1 is the most common estimate.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Friction at Buckling-Restrained Brace Debonding Interfaces

et al. 2022

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“…So far, to the knowledge of the authors, such comprehensive data assessed here are unique and beneficial for the studies on the hazard and risk assessment strategies to mitigate seismic damage in 29%-66% possible strong earthquake (Mw≥7.0) affecting the south of Istanbul with rupturing beneath the sea of Marmara in the next 14 years [18][19]. When viewed from this aspect, this work will be a remarkable contribution to the existing knowledge base for the engineers about the estimation of buildings damage levels after a large-scale earthquake disaster [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Urban Transformation Progress of Reinforced Concrete (Rc) and Masonry-Mixed Buildings in Istanbul

Avci-Karatas

Çatalkaya²

2021

Eskişehir Technical University Journal of Science and Technology a - Applied Sciences and Engineering

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Istanbul city is the center of increasing industrialization in Turkey with proportionally developing problems, such as distorted settlements, and slums, etc. The rapid migration to Istanbul, which is located in the earthquake hazard risk zone, has resulted in a raised population and these structures. Urban regeneration/transformation/planning is expressed as a comprehensive action plan that aims to provide a lasting solution to be economic, physical, social, and environmental conditions of a diverting region to solve the problems in the cities. This paper analyzes the urban transformation process and applications of reinforced concrete (RC) and masonry or mixed masonry-RC buildings in Istanbul within the scope of the urban planning law called "Law on Transformation of Areas at Risk of Natural Disaster" (Law No. 6306 dated 2012). To reach this goal, a total of 400 risky building forms with 150 RC buildings as well as 250 masonry-mixed buildings considered according to Law No. 6306 is compiled and evaluated as risky building data. The general characteristics of the RC and masonry-mixed buildings in Istanbul are determined by a date range of such as 2012-2020. With the results obtained from the paper, significant contributions have been made to the knowledge and technological capabilities at the international/national level.

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Modeling of Buckling Restrained Braces (BRBs) using Full-Scale Experimental Data

Cited by 26 publications

References 22 publications

The Effects of Steel Core Imperfection, Gap Size and Friction Coefficient on the Behavior of All-Steel Buckling Restrained Braces

The Effects of Steel Core Imperfection, Gap Size and Friction Coefficient on the Behavior of All-Steel Buckling Restrained Braces

Experimental Investigation of Friction at Buckling-Restrained Brace Debonding Interfaces

Urban Transformation Progress of Reinforced Concrete (Rc) and Masonry-Mixed Buildings in Istanbul

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