Effect of local instability on capacity of steel beams exposed to fire

Kodur, Venkatesh; Naser, M.Z.

doi:10.1016/j.jcsr.2015.03.015

Cited by 28 publications

(12 citation statements)

References 15 publications

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“…Most composite beams are axially and rotationally restrained in a composite steel-framed structure, and their behaviour in fire depends significantly on the nature and magnitude of the restraints. In the majority of the studies in this area, the behaviour of composite beams exposed to fire has been investigated by performing isolated fire tests or numerically modelling single elements [3][4][5]. Limited tests have been performed on composite beams exposed to fire as part of a structural frame [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Analysis of restrained composite beams exposed to fire using a hybrid simulation approach

Khan

Jiang

Cashell

et al. 2018

Engineering Structures

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Obtaining an accurate simulation of the boundary conditions is very challenging but it is essential in order to represent the true behaviour of the whole structure in fire. In recent years, hybrid simulation has been emerging as an efficient and economical method for simulating realistic boundary conditions in the field of earthquake engineering. This technique can be used to study the load redistribution that may occur in a structural system as a result of locally elevated temperatures. In this paper, the fire-exposed element will be modelled in one analysis (a 3D model) and the rest of the structure in another analysis (a 2D model). This kind of sub-structuring enables the behaviour of the structural system as a whole to be studied. A hybrid simulation (HS) approach is presented and successfully implemented using the OpenFresco and OpenSees software. This approach enables the simulation of the correct restraint provided by the cold structure to the fire affected structural element. The HS analysis of a composite beam is compared with an unrestrained or simply supported version to highlight the difference in behaviour. Finally, the Cardington restrained beam test is modelled to demonstrate the potential of HS technique. Good agreement with the test results highlights that HS approach can be an effective method for studying the behaviour of the whole structural system.

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Section: Introductionmentioning

confidence: 99%

Analysis of restrained composite beams exposed to fire using a hybrid simulation approach

Khan

Jiang

Cashell

et al. 2018

Engineering Structures

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“…Chiou et al, 2009 [7], conclude that the axial restriction of the beam is sufficient to mobilize tensile stresses, but alert for large permanent deformations in the floor, which do not recover during the cooling phase. The beam's shear force capacity should also be carefully analyzed because according to Kodur and Naser, 2015 [8], in some cases such capacity can degrade more rapidly compared to the bending moment during fire. Nguyen and Tan, 2015 [9], point out that boundary conditions play L. C. ROMAGNOLI | V. P. SILVA…”

Section: Introductionmentioning

confidence: 99%

About the use of semi-continuity to remove fireproof coatings in simply supported composite steel and concrete beams

Romagnoli

Silva

2018

Rev. IBRACON Estrut. Mater.

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The behavior under fire conditions of composite steel and concrete beams, not subjected to local buckling (compact steel profile), was studied considering the support rotational stiffness provided by the upper longitudinal slab reinforcement, usually present by means of anti-cracking meshes, and restriction of the steel profile’s lower flange, additional procedure required for development of the support bending moment resistance. Usually composite beams at room temperature are designed as simply supported and the semi-rigidity provided by this longitudinal reinforcement, if considered under fire conditions, may lead to a lower cost solution for fire protection of composite beams. The purpose of this study is to verify the viability of this proposal, using simplified design code methods.

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“…The effect of local instability on capacity of steel beams exposed to fire was conducted by Kodur et al [23]. In this numerical study, the behavior of fire exposed steel beams taking into consideration temperature-induced instabilities was performed.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Seismic Response of Steel Storage Racks with Roller Type Isolator

Álvarez

Maureira-Carsalade

Núñez

et al. 2021

Metals

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This research evaluates the effectiveness of using a roller-type base isolation device with tensile strength in reducing the dynamic response of industrial steel storage racks. These were subjected to a seismic input acting separately in both directions of the structure. The seismic record obtained from the earthquake that occurred in Llolleo, Chile, on 3 March 1985, was used as input. This earthquake was scaled in the frequency domain, adjusting its response spectrum to coincide with the design spectrum required by NCh2745. In the calculations of this spectrum, the most hazardous seismic zone (zone 3) and soft soil (soil III) that amplifies the effect of the low frequencies of the earthquake were considered. These frequencies are the ones that have the most affect on flexible structures such as high racks and systems with base isolation. Numerical time-history analyses were performed in fixed base racks and base isolation racks. In both cases, the models include semi-rigid connections with capacity for plastic deformation and energy dissipation. Parametric analyses were carried out considering the most relevant variables, using an algorithm programmed in MATLAB software. The maximum relative displacement, maximum basal shear load, and maximum absolute floor acceleration were considered as responses of interest. The results showed the effectiveness of using the base isolation device by reducing the absolute accelerations between approximately 75% and 90%, compared to the same fixed rack at its base. This makes it possible to reduce the vulnerability of the stored load to overturn under the action of a severe earthquake.

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Effect of local instability on capacity of steel beams exposed to fire

Cited by 28 publications

References 15 publications

Analysis of restrained composite beams exposed to fire using a hybrid simulation approach

Analysis of restrained composite beams exposed to fire using a hybrid simulation approach

About the use of semi-continuity to remove fireproof coatings in simply supported composite steel and concrete beams

Numerical Study on Seismic Response of Steel Storage Racks with Roller Type Isolator

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