Comparative study on the behaviour of Buckling Restrained Braced frames at fire

Talebi, Elnaz; Tahir, Mahmood Md.; Zahmatkesh, Farshad; Kueh, Ahmad Beng Hong

doi:10.1016/j.jcsr.2014.06.003

Cited by 26 publications

(7 citation statements)

References 17 publications

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“…Eventually, the retardation of a global failure of the whole structure can be ensured. Previous studies (Talebi et al, 2014a) have shown that BRBs can effectively prevent the progressive collapse of a structural frame against fire. This is done due to the additional strength this system append to the building, owing to the unbuckled characteristic of bracing components both in tension and compression.…”

Section: Thermal Analysismentioning

confidence: 98%

“…To achieve this performance, bracing systems, which are most commonly used to resist horizontal forces such as wind and earthquakes, are commonly applied. The existence of bracing systems not only offers an additional strength, they are also effective in enhancing the stiffness of structural frame at elevated temperatures and maintaining the stability of the whole building against fire loadings (Sun et al, 2012a;Talebi et al, 2014a).…”

Section: Latin American Journal Of Solids and Structures 12 (2015) 21mentioning

confidence: 99%

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Fire response of a 3D multi-storey building with buckling restrained braces

Talebi

Tahir

Zahmatkesh

et al. 2015

Lat. Am. j. solids struct.

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This paper investigates the performance of a three-dimensional multi-storey structure with Buckling Restrained Brace system (BRBs) under fire condition, using a sequentially coupled nonlinear thermal stress analysis. Efficiency of using BRBs in enhancing the strength and stiffness of a structural frame is compared with that of Ordinary Concentrically Bracing system (OCBs) under various fire scenarios. The proposed numerical model is verified by a series of full-scale fire tests carried out on an 8-storey structure at Cardington. The results indicate that the vertical movement of heated (buckled) column in the structural frame with BRBs is lesser than that with OCBs. Consequently, the tensile force and bending moment of the beam adjacent to the buckled column in the former is lesser than the latter. Also, BRB elements can perform better in redistributing the load sustained by heated columns without any buckling occurrence in the bracing member, in comparisons to the ordinary system. In general, it is observed that BRBs manifest an improved performance in re-stabilization of structural frame against fire for a longer period of heating time, such that a better fire resistance is offered to the whole building as compared to OCBs, due to a higher restraint provided onto the structure.

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Section: Thermal Analysismentioning

confidence: 98%

Section: Latin American Journal Of Solids and Structures 12 (2015) 21mentioning

confidence: 99%

Fire response of a 3D multi-storey building with buckling restrained braces

Talebi

Tahir

Zahmatkesh

et al. 2015

Lat. Am. j. solids struct.

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“…Fig. 1 The component of BRB [12] The steel core member is designed to resist the axial forces with a full tension or compression yield capacity without the local or global flexural buckling failure [10]. The principal advantage of BRBs is their ability to yield in both compression and tension.…”

Section: Introductionmentioning

confidence: 99%

“…Fig 12. Fragility curves of invert-chevron BRBs at IO and CP limit states Fig.13Mean annual frequency of BRBFs at IO and CP limit states…”

mentioning

confidence: 99%

Effects of Brace Configuration and Structure Height on Seismic Performance of BRBFs Based on the Collapse Fragility Analysis

Shokrgozar

Golsefidi

et al. 2020

Period. Polytech. Civil Eng.

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The brace configuration and structure height are two factors that have a significant effect on the seismic behavior of braced frame buildings. In the present study, the buckling-restrained braced (BRB) frames were considered to estimate the effect of these two parameters using probabilistic seismic assessment methods. The uncertainty in the different parameters involved in the seismic design of the structural system was also considered. Four, six, and ten-story buildings with the Chevron and inverted Chevron bracing configurations were designed, and their responses due to various ground motions were estimated using incremental nonlinear dynamic analyses. Fragility curves, mean annual frequency of exceeding immediate occupancy (IO), and collapse prevention (CP) states were generated using probabilistic seismic analysis, fragility curves concept, and drift hazard curves. The results demonstrate that the inverted Chevron type BRBFs has better structural performance than Chevron bracing types. Furthermore, an increase of the height of structures, despite lower drift’s hazards, increases the fragility probability.

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“…Patel et al considered the influences of local buckling and proposed a fiber model to analyze CFST beam columns [15]. On the other hand, some structural measurements were proposed to resist local buckling in previous studies, such as setting straight ribs [16], tensile sheets [17], longitudinal and transverse stiffeners [18,19], binding bars [20], angle braces, and other kinds of buckling restrained braces [21,22]. Such measurements can improve the effect of steel tubes on confining concrete, but also result in construction operation difficulties, like the increase of welding workload and a decrease in construction quality.…”

Section: Introductionmentioning

confidence: 99%

Research on Compression Behavior of Square Thin-Walled CFST Columns with Steel-Bar Stiffeners

Yang

2018

Applied Sciences

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Local buckling in steel tubes was observed to be capable of reducing the ultimate loads of thin-walled concrete-filled steel-tube (CFST) columns under axial compression. To strengthen the steel tubes, steel bars were proposed in this paper to be used as stiffeners fixed onto the tubes. Static-loading tests were conducted to study the compression behavior of square thin-walled CFST columns with steel bar stiffeners placed inside or outside the tube. The effect and feasibility of steel bar stiffeners were studied through the analysis of failure mode, load–displacement relationship, ultimate load, ductility, and local buckling. Different setting methods of steel bars were compared as well. The results showed that steel-bar stiffeners proposed in this paper can be effective in delaying local buckling as well as increasing the bearing capacity of the columns, but will decrease the ductility of the columns. In order to obtain a higher bearing capacity of columns, steel bars with low stiffness should be placed inside and steel bars with high stiffness should be placed outside of the steel tubes. The study is helpful in providing reference to the popularization and application of this new structural measure to avoid or delay the local buckling of thin-walled CFST columns.

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Comparative study on the behaviour of Buckling Restrained Braced frames at fire

Cited by 26 publications

References 17 publications

Fire response of a 3D multi-storey building with buckling restrained braces

Fire response of a 3D multi-storey building with buckling restrained braces

Effects of Brace Configuration and Structure Height on Seismic Performance of BRBFs Based on the Collapse Fragility Analysis

Research on Compression Behavior of Square Thin-Walled CFST Columns with Steel-Bar Stiffeners

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