Explosion and Fire Analysis of Steel Frames Using Fiber Element Approach

Liew, J.Y. Richard; Hong, Chen

doi:10.1061/(asce)0733-9445(2004)130:7(991)

Cited by 83 publications

(35 citation statements)

References 26 publications

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“…Their formulation makes use of stability functions for the transverse displacements, and it also considers the elastic coupling of axial, flexural and torsional deformations. Later, Liew et al [8,9] developed their numerical non-linear analysis of a structure subjected to fire and explosion. Similarly, Iu et al [10,11] presented the non-linear fire analysis of steel structure including heating and cooling behaviour.…”

mentioning

confidence: 99%

Higher-Order Non-Linear Analysis of Steel Structures Part I : Elastic Second-Order Formulation

Iu¹,

Bradford²

2012

Volume 8 Number 2

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This paper presents a higher-order beam-column formulation that can capture the geometrically non-linear behaviour of steel framed structures which contain a multiplicity of slender members. Despite advances in computational structural frame software, analyses of large frames can still be problematic from a numerical standpoint, with efficacious and reliable convergence not always being ensured. To this end, the intent of this paper is to fulfil a need for versatile, reliable and efficient non-linear analysis of general steel framed structures with a large number of members suitable for engineering practice. Following a comprehensive review of numerical frame analysis techniques, a fourth-order element is derived, in which the crucial member bowing effect involved in the equilibrium equation is captured, and implemented in an updated Lagrangian formulation. Because of this, it is able to predict flexural buckling, snap-through buckling and the large displacement post-buckling behaviour of typical structures whose responses have been reported by independent researchers. The present approach with its efficacious and reliable convergence is shown in comparison studies to be applicable to selected applications which are prone to several forms of geometric non-linearity.Keywords: Beam-column, Frames, Geometric non-linearity, Higher-order element, Steel, Updated lagrangian INTRODUCTIONDisplacement-based finite element techniques have been the most favoured for frame structures, mainly because of their accuracy, versatility, fully-established mathematical (variational) basis, and their suitability for computer implementation. The finite element method is based on the general principle that equilibrium of the structure under applied loading is achieved at displacements which correspond to the potential energy of the structure being stationary. In the description of the kinematic deformations of framed structures is favourably based on an updated Lagrangian system. proposed a second-order analysis which allows for the geometric non-linear behaviour using one element. Their formulation makes use of stability functions for the transverse displacements, and it also considers the elastic coupling of axial, flexural and torsional deformations. Later, Liew et al. [8,9] developed their numerical non-linear analysis of a structure subjected to fire and explosion. Similarly, Iu et al. [10,11] presented the non-linear fire analysis of steel structure including heating and cooling behaviour.

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mentioning

confidence: 99%

Higher-Order Non-Linear Analysis of Steel Structures Part I : Elastic Second-Order Formulation

Iu¹,

Bradford²

2012

Volume 8 Number 2

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“…There is also a possibility of local buckling of steel sections under blast loading. High strain rates will enhance the yield strength of materials while the Young's modulus remains almost unchanged (Liew and Chen, [15]). When the strain-rate is varied from 1.0 to 10 3 sec -1 , the yield strength is increased by a factor of 1.44 to 1.79 according to the strain rate model proposed by Soroushian and Choi [18].…”

Section: Analysis Of Structures Subjected To Blastmentioning

confidence: 99%

“…In case of direct analysis of the overall building response subjected to localized fires, a mixed use of different element types is required in which the fire affected members may be modeled using the shell elements and those not affected by fire may be modeled using beam elements. Some examples of the use of mixed element modeling technique can be found from Liew and Chen [14,15] and Liew et al [25].…”

Section: Post-flash Over Decaymentioning

confidence: 99%

“…An integrated analysis environment is developed, in which, the blast loading is solved by explicit dynamic analysis techniques and the fire loading is solved by implicit dynamic analysis. Liew and Chen [15] investigated the interaction of blast and fire load on the performance of single members and two-dimensional steel frames using ABAQUS implicit dynamic solver. Recently, Liew and Chen [14] extend the work to three dimensional steel frames in which local and lateral torsional buckling of beams was modeled and progressive collapse of building occurred when critical columns in the building buckled under the fire attack.…”

Section: Analysis Of Structures Subjected To Blast and Firementioning

confidence: 99%

“…However, the fire resistance of structures after the action of blast has been investigated by only a few researchers (Song et al, [11]; Izzuddin et al, [12]; Liew and Chen [13,14]). Song et al [15] developed a program with appropriate solvers for blast and fire effects. Liew and Chen studied the resistance of some members or simple frames subjected to fire followed by blast.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Steel Framed Structures Subjected to the Combined Effects of Blast and Fire - Part 1: State-of-the-Art Review

Yu¹,

Liew²

2005

Volume 1 Number 1

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Design of public infrastructure against terrorism has become a rising concern with the objective of reducing the level of damage to property and the loss of life. Some of the terrorism acts take the form of blast followed by fire causing catastrophic failure of the structure. This paper studies the response of steel framed structures subjected to the combined effects of blast and fire. A state-of-the-art summary on issues related to separate assessment of blast and fire resistance of multistory building frames is provided. This is followed by a systematic investigation on the combined effects of blast and fire using a proposed two-step dynamic analysis procedure. In Part 2 of a companion paper, a typical multi-storey building will be analyzed to study its behavior under a medium-scale explosion which triggers a post-blast fire in the affected compartment. This particular structure is found to be vulnerable as it possesses little fire resistance due to the high level of deformation caused by the blast load. The aim of this two-part paper is to advance the use of simulation tools for c co ol ll la ap ps se e a an na al ly ys si is s o of f three dimensional steel structures s su ub bj je ec ct t t to o a at tt ta ac ck k b by y f fi ir re e a an nd d e ex xp pl lo os si io on n so that the complex interaction effects of blast and fire can be understood and quantified.

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10.04: Behaviour of plane frames of high strength steel in fire

2017

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Mechanical properties given in the design code EN 1993-1-2, are obtained from researches on low strength mild steel. The applicability of these material properties to high strength steel (HSS) grade is thus, an area of interest. In this study, the behaviour of a planar frame made of high strength steel (HSS) in fire is studied by applying the finite element method. A material model was created using stress-strain formulation from EN 1993-1-2 with reduction factors being from elevated temperature tests of HSS in literature as well as from EN 1993-1-2. FE analysis is carried out by Abaqus software using dynamic explicit solver so that non-linear deformations can be simulated. Continuum elements are used to create FE model because of their capabilities to catch temperature distribution and local failure across cross-sections of frame members. The FE model is validated by simulating experimental tests on mild steel frame from literature. With this validated model, the behaviour of the frames made of mild steel or HSS were compared based on deformation, critical temperatures, duration for collapse, and failure modes. Further, the behaviour of HSS frames using material data from different references were also compared. It is observed that deviations of mechanical properties at elevated temperatures from those in EN 1993-1-2 affect the behaviour of the frame. Keywords: high strength steel, material model, planar steel frame, structural fire engineering. https://doi.org/10.1002/cepa.302 wileyonlinelibrary.com/journal/cepa | 2535

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Explosion and Fire Analysis of Steel Frames Using Fiber Element Approach

Cited by 83 publications

References 26 publications

Higher-Order Non-Linear Analysis of Steel Structures Part I : Elastic Second-Order Formulation

Higher-Order Non-Linear Analysis of Steel Structures Part I : Elastic Second-Order Formulation

Steel Framed Structures Subjected to the Combined Effects of Blast and Fire - Part 1: State-of-the-Art Review

10.04: Behaviour of plane frames of high strength steel in fire

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