Publications
355 results found
Izzuddin BA, Elghazouli AY, Tao XY, 2002, Realistic modelling of composite floor slabs under fire conditions, Proceedings of the 15th ASCE engineering mechanics conference, New York, June 2002
Izzuddin BA, 2002, Structural assessment of steel-framed buildings subject to explosion and fire, Singapore, Proceedings of the international symposium on structures in fire, Singapore, 25 October 2002, Publisher: Singapore Structural Steel Society, Pages: 103-118
Izzuddin BA, 2002, Advanced large displacement analysis of composite floor slabs, Proceedings of the 15th ASCE engineering mechanics conference, New York, June 2002
Izzuddin BA, 2001, Conceptual issues in geometrically nonlinear analysis of 3D framed structures, COMPUT METHOD APPL M, Vol: 191, Pages: 1029-1053, ISSN: 0045-7825
This paper aims to clarify some of the conceptual issues which are related to the geometrically nonlinear analysis of 3D framed structures, and which have been a source of previous confusion. In particular, the paper discusses the symmetry of the tangent stiffness matrix and the nature of the element end moments. It is shown that a symmetric tangent stiffness matrix can always be achieved for a conservative system if the nodal equilibrium equations, including the equations which describe moment equilibrium, are identical to those derived from a variational energy approach. With regard to the element end moments, it is suggested that any definition can be adopted in formulating the geometrically nonlinear element response. Furthermore, it is proposed that any definition for nodal rotations expressing a unique vector transformation may be adopted without compromising modelling accuracy. The argument of this paper is validated with reference to three variants of a large displacement analysis method for 3D frames, where several illustrative examples are utilised. (C) 2001 Published by Elsevier Science B.V.
Elghazouli AY, Izzuddin BA, 2001, Analytical assessment of the structural performance of composite floors subject to compartment fires, FIRE SAFETY J, Vol: 36, Pages: 769-793, ISSN: 0379-7112
The behaviour of composite steel-concrete building floors exposed to fire conditions is examined in this paper. The work represents part of a large project dealing with the numerical modelling and assessment of structural behaviour based on the fire experiments undertaken on a full-scale multi-storey steel-framed building at Cardington, UK. After providing brief details on the analytical tools and modelling approaches adopted in this investigation, the structural models constructed to simulate the fire tests are described and salient findings are highlighted. Although the detailed models provide some insight into key behavioural aspects such as the paramount influence of restraint to thermal expansion, the complex structural interactions that occur under fire conditions may not be readily demonstrated. In order to illustrate a number of underlying response mechanisms, the analytical results obtained from an idealised structural system, in which a single compartment is subjected to fire, are summarised. Assessment of the structural response using such simplified models provides a clear interpretation of the behaviour and, with further refinements, may be employed for undertaking detailed studies aimed at developing improved design recommendations. (C) 2001 Elsevier Science Ltd. All rights reserved.
Izzuddin BA, 2001, Blast Response of Steel Offshore Structures - Assessment and Interaction with Fire, Technical Discussion, FABIG Newsletter, The Steel Construction Institute, Pages: 16-31
Tao XY, Izzuddin BA, Elghazouli AY, 2001, An advanced finite element formulation for composite floor slabs, Birmingham, Association for computational mechanics in engineering, Publisher: University of Birmingham, Pages: 107-110
Izzuddin BA, Tao XY, Elghazouli AY, 2001, Non-linear analysis of composite floor slabs with geometric orthotropy, International conference on civil and structural engineering computing, Publisher: Civil-Comp Press, Pages: 191-192
Elghazouli AY, Izzuddin BA, 2001, Modelling of the structural fire response of steel framed buildings, International conference on civil and structural engineering computing, Publisher: Civil-Comp Press, Pages: 119-120
Elghazouli AY, Izzuddin BA, 2000, Response of idealised composite beam-slab systems under fire conditions, J CONSTR STEEL RES, Vol: 56, Pages: 199-224, ISSN: 0143-974X
This paper presents a numerical model for beam-slab floor systems in which a single compartment is subjected to fire. The system consists of a composite steel-concrete slab and a bare steel beam. Several idealisations are made in order to illustrate important behavioural patterns which occur under fire conditions. Nonlinear analyses are undertaken using an advanced yet computationally efficient computer program which accounts for the large displacement behaviour at elevated temperatures. The model is shown to capture the main parameters influencing the performance of the system under fire. In particular, the significance of axial restraint and thermal expansion on the overall deformation and capacity of the system is demonstrated. It is indicated that thermal expansion may have beneficial as well as detrimental consequences on the performance, depending on the particular structural configuration under consideration. The paper also closely examines the level of dependency of the response on the sequence of application of loading and elevated temperature as well as the assessment of the overall system response from consideration of the respective responses of individual components. It is shown that such concepts may be effectively employed in undertaking detailed studies for improved quantification of the fire resistance of beam-slab systems with a view to the development of more rational performance-based design procedures. (C) 2000 Elsevier Science Ltd. All rights reserved.
Izzuddin BA, Smith DL, 2000, Efficient nonlinear analysis of elasto-plastic 3D R/C frames using adaptive techniques, COMPUT STRUCT, Vol: 78, Pages: 549-573, ISSN: 0045-7949
This paper presents a new nonlinear analysis method for three-dimensional reinforced concrete (R/C) frames employing adaptive analysis concepts. The first two components of the proposed adaptive method, namely the elastic and elasto-plastic beam-column formulations, are described. The details of automatic mesh refinement, which is the third component of the adaptive method, are then presented. These include the construction of an effective interaction surface representing generalised stress states at the elastic limit, the determination and checking of generalised stresses for exceeding the elastic limit along an elastic element, and the refinement of an elastic element into an appropriate number of elastic and elasto-plastic elements. Examples are finally presented to illustrate the accuracy and efficiency of the proposed analysis method. (C) 2000 Elsevier Science Ltd. All rights reserved.
Elghazouli AY, Izzuddin BA, Richardson AJ, 2000, Numerical modelling of the structural fire behaviour of composite buildings, FIRE SAFETY J, Vol: 35, Pages: 279-297, ISSN: 0379-7112
This paper describes numerical models constructed to simulate the response of composite steel/concrete building floors under fire conditions. In particular, this study deals with two of the fire tests recently undertaken on a full-scale multi-storey building at Cardington, UK. The analysis is carried out using a structural analysis program which accounts for both geometric and material nonlinearities, and which includes temperature-dependent constitutive models for steel and concrete materials. The approaches used to represent the various structural details are discussed, and the procedure employed for incorporating the experimentally measured temperature profiles and histories is outlined. For the two tests considered in this investigation, the numerical results are in general agreement with the experimental data, particularly in terms of the magnitude of vertical deformations induced in the floors at elevated temperatures. Close examination of the numerical and experimental findings provides an insight into the complex interactions that occur in the structure at elevated temperatures. Most significantly, the influence of the restraint to thermal expansion of the heated floor area, which is provided by the surrounding parts of the structure, is shown to be of paramount importance. The increasing confidence that can be placed in numerical models as well as the improved understanding of the structural fire response may be used in developing more realistic and cost-effective design methods which are based on the actual structural response rather than that of isolated members. (C) 2000 Elsevier Science Ltd. All rights reserved.
Izzuddin BA, 2000, Symmetry of tangent stiffness matrices of 3D elastic frame - Discussion, JOURNAL OF ENGINEERING MECHANICS-ASCE, Vol: 126, Pages: 662-663, ISSN: 0733-9399
Izzuddin BA, Song L, Elnashai AS, et al., 2000, An integrated adaptive environment for fire and explosion analysis of steel frames - Part II: verification and application, J CONSTR STEEL RES, Vol: 53, Pages: 87-111, ISSN: 0143-974X
The companion paper presents a new adaptive method for integrated fire and explosion analysis of steel frames. This paper verifies the new developments, implemented within the nonlinear analysis program ADAPTIC, particularly against the results of experiments on steel members and frames subjected to fire. The benefits of adaptive nonlinear analysis are then highlighted by means of an example which demonstrates its computational superiority over conventional nonlinear analysis. Finally, parametric studies on column and frame configurations subject to the successive actions of explosion and fire are undertaken using the developed integrated analysis tool. The results of these preliminary studies indicate that the damage induced by moderate explosion loading can significantly influence the fire resistance of steel structures. Collectively, the capabilities and efficiency of the developed environment emphasise the important role that it can play in further studies aimed at generating design guidance. (C) 2000 Elsevier Science Ltd. All rights reserved.
Song L, Izzuddin BA, Elnashai AS, et al., 2000, An integrated adaptive environment for fire and explosion analysis of steel frames - Part I: analytical models, J CONSTR STEEL RES, Vol: 53, Pages: 63-85, ISSN: 0143-974X
This paper presents a new method for the nonlinear analysis of steel frames subject to fire and explosion loading conditions. The proposed method subsumes conventional nonlinear analysis in that it can be applied to the two cases of fire and explosion loading in isolation and, more significantly, within the same analysis. The resulting integrated approach can therefore be used to study the behaviour of steel members and frames subject to scenarios of explosion loading followed by fire, effectively enabling the influence of explosion on the fire resistance to be evaluated. The paper describes the component beam-column formulations and discusses their incorporation within an adaptive analysis framework, which is largely responsible for the considerable efficiency of the proposed method. Details of the required elasto-plastic material models are finally presented, including the adopted models for steel subject to elevated temperatures, creep and high strain-rates. The companion paper provides several verification and application examples, using the nonlinear analysis program ADAPTIC, which demonstrate the accuracy and efficiency of the proposed method, and which investigate the influence of explosion on the fire resistance of steel members and frames. (C) 2000 Elsevier Science Ltd. All rights reserved.
Izzuddin BA, 2000, Conceptual Issues in Geometrically Nonlinear Analysis of 3D Framed Structures, Computational Methods for Shell and Spatial Structures
Pargana JB, Lloyd Smith D, Izzuddin BA, 2000, Advanced Material Model for the Analysis of Tensioned Fabric Structures, International Conference on Computational Methods for Shell and Spatial Structures, Athens
Izzuddin BA, 2000, Adaptivity in Nonlinear Structural Analysis of Frames: Perspectives of Practicality and Accuracy (Keynote Lecture), Computational Methods for Shell and Spatial Structures
Elghazouli AY, Izzuddin BA, Richardson AJ, 2000, Numerical Modelling of the Structural fire Behaviour of a Full-Scale Steel-Framed Building, CESLIC (PIT Project Report) CC15, London, Publisher: Dept. Civil Engineering, Imperial College, MD15/AM7
Chew A, Izzuddin BA, Lloyd Smith D, 2000, Estimation of Equilibrium Errors for Nonlinear Frame Analysis, 8th Association for Computational Mechanics in Engineering (ACME-UK) Conference, Greenwich
Elghazouli AY, Izzuddin BA, 1999, Significance of local buckling for steel frames under fire conditions, Amsterdam, 4th international conference on steel and aluminium structures (icsas 99) JUN 20-23, 1999 ESPOO, FINLAND, Publisher: Elsevier Science Publ B V, Pages: 727-734
Elghazouli AY, Izzuddin BA, 1999, Significance of local buckling for steel frames under fire conditions, Amsterdam, 4th international conference on steel and aluminium structures (icsas 99) JUN 20-23, 1999 ESPOO, FINLAND, Publisher: Elsevier Science Publ B V, Pages: 727-734
Izzuddin BA, Elghazouli AY, 1999, A Simplified Model for Beam-Slab Systems Subject to Fire, Proceedings of the 2nd European Conference on Steel Structures (Eurosteel'99), Prague, Czech Republic
Siyam, AAFM, Izzuddin BA, et al., 1999, Significance of Strain Reversal in Concrete for Adaptive Nonlinear Analysis, 7th Association for Computational Mechanics in Engineering (ACME-UK) Conference, Durham
Izzuddin BA, Lloyd Smith D, 1998, Advanced nonlinear analysis of 3D reinforced concrete frames, Edinburgh, 1st international conference on engineering computational technology / 4th international conference on computational structures technology AUG 18-21, 1998 EDINBURGH, SCOTLAND, Publisher: Civil Comp Press, Pages: 181-185
Izzuddin BA, 1998, Adaptive Contact Analysis of Framed Structures, 6th Association for Computational Mechanics in Engineering (ACME-UK) Conference, Exeter, Pages: 147-150
Izzuddin BA, Lloyd Smith D, 1998, Advanced nonlinear analysis of 3D reinforced concrete frames, Edinburgh, 1st international conference on engineering computational technology / 4th international conference on computational structures technology AUG 18-21, 1998 EDINBURGH, SCOTLAND, Publisher: Civil Comp Press, Pages: 181-185
Quinn MP, Izzuddin BA, 1998, Global structural cost optimization by simulated annealing, Edinburgh, 1st international conference on engineering computational technology / 4th international conference on computational structures technology AUG 18-21, 1998 EDINBURGH, SCOTLAND, Publisher: Civil Comp Press, Pages: 143-147
Izzuddin BA, Fang Q, 1997, Rate-sensitive analysis of framed structures .1. Model formulation and verification, STRUCTURAL ENGINEERING AND MECHANICS, Vol: 5, Pages: 221-237, ISSN: 1225-4568
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- Citations: 25
Fang Q, Izzuddin BA, 1997, Rate-sensitive analysis of framed structures .2. Implementation and application to steel and R/C frames, STRUCTURAL ENGINEERING AND MECHANICS, Vol: 5, Pages: 239-256, ISSN: 1225-4568
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- Citations: 9
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