Imperial College London

ProfessorAhmedElghazouli

Faculty of EngineeringDepartment of Civil and Environmental Engineering

Professor of Structural Engineering - Section Head
 
 
 
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Contact

 

+44 (0)20 7594 6021a.elghazouli

 
 
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Assistant

 

Ms Ruth Bello +44 (0)20 7594 6040

 
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Location

 

440Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

258 results found

Bompa DV, Elghazouli AY, 2018, Seismic Performance and Application of Mechanical Splices in Dissipative RC Structures

REPORT

Bompa DV, Elghazouli AY, 2018, Ductility of Reinforced Concrete Members Incorporating Mechanical Splices, 16th European Conference on Earthquake Engineering (16ECEE)

CONFERENCE PAPER

Bravo-Haro M, Elghazouli AY, 2018, INFLUENCE OF GROUND MOTION DURATION ON THE SEISMIC RESPONSE OF STEEL MOMENT FRAMES, 16th European Conference on Earthquake Engineering (16ECEE)

CONFERENCE PAPER

Bravo-Haro MA, Elghazouli AY, 2018, Permanent seismic drifts in steel moment frames, Journal of Constructional Steel Research, Vol: 148, Pages: 589-610, ISSN: 0143-974X

© 2018 Elsevier Ltd This paper examines residual drift demands in steel moment-resisting frames incorporating the influence of degradation and ground motion frequency content. Detailed assessments are carried out using 54 multi-storey framed buildings, with a wide range of structural characteristics, which are designed according to the provisions of Eurocode 8. In order to identify the influence of cyclic and in-cycle degradation effects, the analysis is carried out with and without degradation modelling. Incremental dynamic analysis is employed in order to achieve various limits of lateral strength demand, using a suite of 56 ground motion records. It is shown that residual drifts are markedly higher in degrading models in comparison with non-degrading models, with the differences being more pronounced in relatively short period ranges, when higher rates of cyclic deterioration are employed, and for comparatively high lateral strength demand levels. The residual drift demand is also shown to increase with the increase in number of stories, and is often concentrated in the lower levels when degrading models are used. Overall, significant residual drift demands are observed in the structural systems considered, with a high likelihood of exceeding a 0.5% residual drift limit in most cases. Based on the results, two simplified prediction relationships are proposed to estimate the permanent drifts of multi-storey steel moment framed systems. The first is concerned with the design stage based on the results of elastic analysis, whilst the second is associated with post-earthquake structural assessment based on actual measurements of residual drifts.

JOURNAL ARTICLE

Bravo-Haro MA, Tsitos A, Elghazouli AY, 2018, Drift and rotation demands in steel frames incorporating degradation effects, Bulletin of Earthquake Engineering, Pages: 1-32, ISSN: 1570-761X

© 2018 Springer Science+Business Media B.V., part of Springer Nature This paper is concerned with the assessment of seismic drift demands in steel moment frames designed to comply with Eurocode 8 provisions, with due account for cyclic and in-cycle degradation. In addition to degradation effects, the main parameters examined include the ground motion frequency content as well as the level of constant relative strength or inelasticity. To represent a wide range of structural characteristics, a set of 54 multi-storey frames are considered, in which the number of stories, steel profiles, seismic hazard and compliance criteria are varied. Detailed incremental dynamic analyses are performed on the full set of frames using a suite of 56 far-field ground motion records, which are scaled appropriately to achieve different levels of inelastic demand or equivalent behaviour factors. The seismic performance is evaluated in terms of maximum global and local drifts as well as beam chord rotations. Characteristic results show that maximum response in terms of global deformations and inter-storey drifts is significantly affected by degradation phenomena, along with the ground motion frequency content and the level of inelastic demand. For medium rise typologies subjected to earthquakes with relatively high frequency content, concentration of seismic demand in terms of inter-storey drift is captured by the degrading models and leads to early development of plastic mechanisms. The seismic demand scenarios used in this study, through spectral acceleration-based scaling of ground motions, indicate that the influence of degradation can be significant not only at collapse levels but also at those associated with typical design situations. Finally, based on the extensive analyses carried out in this investigation, expressions for predicting the global and local demands are proposed and discussed.

JOURNAL ARTICLE

Elghazouli AY, Bompa DV, Xu B, Ruiz-Teran A, Stafford Pet al., 2018, Performance of Rubberised Reinforced Concrete Members under Cyclic Loading, 16th European Conference on Earthquake Engineering (16ECEE)

CONFERENCE PAPER

Elghazouli AY, Bompa DV, Xu B, Ruiz-Teran AM, Stafford PJet al., 2018, Performance of rubberised reinforced concrete members under cyclic loading, ENGINEERING STRUCTURES, Vol: 166, Pages: 526-545, ISSN: 0141-0296

JOURNAL ARTICLE

Goggins J, Broderick BM, Elghazouli AY, Salawdeh S, Hunt A, Mongabure P, English Jet al., 2018, Shake Table Testing of Concentrically Braced Steel Structures With Realistic Connection Details Subjected to Earthquakes, STRUCTURES, Vol: 13, Pages: 102-118, ISSN: 2352-0124

JOURNAL ARTICLE

Ho HC, Liu X, Chung KF, Elghazouli AY, Xiao Met al., 2018, Hysteretic behaviour of high strength S690 steel materials under low cycle high strain tests, ENGINEERING STRUCTURES, Vol: 165, Pages: 222-236, ISSN: 0141-0296

JOURNAL ARTICLE

Li Z, Liu Y, Huo J, Rong H, Chen J, Elghazouli AYet al., 2018, Experimental assessment of fire-exposed RC beam-column connections with varying reinforcement development lengths subjected to column removal, Fire Safety Journal, Vol: 99, Pages: 38-48, ISSN: 0379-7112

© 2018 Elsevier Ltd This paper describes an experimental investigation into the behaviour of RC beam-column connections under a column removal scenario induced by fire. A purpose-built hybrid heating furnace is employed to carry out the fire tests on five RC connections with varying reinforcement development lengths, with and without cooling effects. The thermal response of the RC connection specimens, including the temperature field and the axial force-furnace temperature curves, is firstly described. Subsequently, push-down tests are carried out on the beam-column connections, and the horizontal support reactions are closely monitored using a specially-designed sensor system. Based on the experimental results, the joint vertical load-displacement and bending moment-rotation relationships are presented, together with an account of the failure modes observed. The mechanical behaviour is discussed in detail, including the tying and rotation capacity provided by the connection specimens, with emphasis on the effect of the reinforcement development length as well as the heating regime. The experimental capacity interaction curves are also compared with the theoretical prediction for ambient condition, and employed to carry out a detailed examination of the underlying failure mechanisms. Finally, the findings are used to provide practical recommendations for enhancing the structural robustness of structural configurations of the form considered in this study.

JOURNAL ARTICLE

Sirumbal-Zapata LF, Malaga-Chuquitaype C, Elghazouli AY, 2018, A three-dimensional plasticity-damage constitutive model for timber under cyclic loads, COMPUTERS & STRUCTURES, Vol: 195, Pages: 47-63, ISSN: 0045-7949

JOURNAL ARTICLE

Tsitos A, Bravo-Haro MA, Elghazouli AY, 2018, Influence of deterioration modelling on the seismic response of steel moment frames designed to Eurocode 8, EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS, Vol: 47, Pages: 356-376, ISSN: 0098-8847

JOURNAL ARTICLE

Bompa DV, Elghazouli AY, 2017, Punching shear strength of RC flat slabs provided with shear-heads at interior connections to steel columns, Pages: 823-831

© Springer International Publishing AG 2018. This paper investigates the structural performance of cruciform shear-head systems fully integrated in RC flat slabs at interior connections to steel columns. The test results from a series of six large scale members of which two were provided with headed shear studs, offer a direct evaluation of the full load-deformation behaviour of the specimens as well as the ultimate punching shear strength attained prior to failure at the critical slab perimeter outside the shear-head region. Particular focus is given to the influence of the shear-head and headed shear stud reinforcement to the member kinematics and failure characteristics. The experimental findings coupled with shear field analyses enable the development of analytical models that depict the rotational response and flexural strength as a function of the shear-head characteristics, and support the definition of a shear-head dependent control perimeter required for punching shear strength assessments. Additionally, analytical design expressions that adopt the fundamentals of Model Code 2010, which account for the characteristics of the shear-head system, are proposed and their results capture in a more realistic manner the shear-head influence on the punching shear strength of RC flat slabs in such hybrid configurations in comparison with strength predictions from current conventional RC design methods.

CONFERENCE PAPER

Bompa DV, Elghazouli AY, 2017, Numerical modelling and parametric assessment of hybrid flat slabs with steel shear heads, ENGINEERING STRUCTURES, Vol: 142, Pages: 67-83, ISSN: 0141-0296

JOURNAL ARTICLE

Bompa DV, Elghazouli AY, 2017, Bond-slip response of deformed bars in rubberised concrete, Construction and Building Materials, Vol: 154, Pages: 884-898, ISSN: 0950-0618

This paper is concerned with examining the complete bond-slip behaviour between deformed reinforcement bars and concrete incorporating rubber particles from recycled tyres as a partial replacement for mineral aggregates. An experimental study consisting of fifty-four pull-out tests on cylindrical rubberised and normal concrete specimens, in conjunction with two reinforcement sizes with short embedment lengths, is described. In addition to a detailed assessment of the full bond-slip relationship, the test results offer a direct interpretation of bond behaviour under practical levels of confinement and its influence on the failure modes. Particular emphasis is given to the characteristic bond behaviour of rubberised concrete in terms of maximum bond strength and splitting strength as well bond stiffness and slip parameters. The detailed test measurements and observations provided in this study enable the definition of key bond parameters depicting the interfacial behaviour between rubberised concrete and deformed bars. The findings also permit the development of modified approaches for reliable representation of the failure modes and bond capacities for the concrete materials considered in this investigation.

JOURNAL ARTICLE

Bompa DV, Elghazouli AY, 2017, Ultimate Behaviour and Design of Hybrid Flat Slabs with Steel Shear Heads, Eurosteel2017

CONFERENCE PAPER

Bompa DV, Elghazouli AY, 2017, Ductility considerations for mechanical reinforcement couplers, STRUCTURES, Vol: 12, Pages: 115-119, ISSN: 2352-0124

JOURNAL ARTICLE

Bompa DV, Elghazouli AY, Xu B, Stafford PJ, Ruiz-Teran AMet al., 2017, Experimental assessment and constitutive modelling of rubberised concrete materials, CONSTRUCTION AND BUILDING MATERIALS, Vol: 137, Pages: 246-260, ISSN: 0950-0618

JOURNAL ARTICLE

Bravo-Haro M, Tsitos A, Elghazouli AY, 2017, Influence of Deterioration Modelling on Local Deformation Demands in Steel Moment Frames, Eurosteel2017

CONFERENCE PAPER

Bravo-Haro MA, Tsitos A, Elghazouli AY, 2017, Influence of cyclic degradation on inelastic seismic demands in steel moment frames, 16th World Conference on Earthquake Engineering, Pages: paper No 1033-paper No 1033

CONFERENCE PAPER

Cedron F, Elghazouli AY, 2017, Seismic Behaviour of Single Layer Cylindrical Lattice Steel Shells, Eurosteel2017

CONFERENCE PAPER

Elghazouli AY, 2017, Seismic Design of Buildings to Eurocode 8 - Second Edition, London and New York, Publisher: Spon Press - Taylor & Francis, ISBN: 9780415447621

BOOK

Elghazouli AY, 2017, Seismic design of building structures to Eurocode 8, CSCEHKB Conference, Pages: 62-69

CONFERENCE PAPER

Elghazouli AY, 2017, Seismic Performance of Structural Members Incorporating Recycled Rubber Materials, XVII ANIDIS Conference on Earthquake Engineering, Pages: KL25-KL33

CONFERENCE PAPER

Elghazouli AY, Bompa DV, Xu B, Stafford PJ, Ruiz-Teran AMet al., 2017, Inelastic behaviour of RC members incorporating high deformability concrete, Pages: 2399-2406

©Springer International Publishing AG 2018. This paper examines the inelastic behaviour of dissipative zones in structural members incorporating high deformability concrete materials in which mineral aggregates are partly replaced by rubber particles. An experimental study on three large-scale circular reinforced concrete column specimens, subjected to lateral cyclic displacements and co-existing axial loads, is described. The testing arrangement, specimen details, and main observations, are presented and discussed. The test results enable a direct assessment of the strength and ductility characteristics of the specimens. In particular, the study permits an evaluation of the comparative performance of structural members with and without rubber replacement, as well as the influence of external confinement. The results show that, in comparison with conventional reinforced concrete members, structural elements incorporating a significant proportion of aggregate replacement by rubber particles can offer a good balance between bending capacity and ductility, particularly for modest levels of co-existing axial loads. For column members required to sustain substantial gravity loads, favourable performance can be achieved in rubberised concrete members by means of strength enhancement through external confinement such as fibre reinforced sheets. Based on the experimental findings, the main material and response parameters are discussed and their influence on the overall structural behaviour are highlighted.

CONFERENCE PAPER

Elghazouli AY, Castro JM, 2017, Design of Steel Structures, Seismic Design of Buildings to Eurocode 8, Editors: Elghazouli, Pages: 157-192, ISBN: 9781498751599

BOOK CHAPTER

Elghazouli AY, Castro JM, 2017, Design of Composite Steel/Concrete Structures, Seismic Design of Buildings to Eurocode 8, Editors: Elghazouli, Pages: 193-212, ISBN: 978-1-4987-5159-9

BOOK CHAPTER

Karagiannis V, Malaga-Chuquitaype C, Elghazouli AY, 2017, Behaviour of hybrid timber beam-to-tubular steel column moment connections, ENGINEERING STRUCTURES, Vol: 131, Pages: 243-263, ISSN: 0141-0296

JOURNAL ARTICLE

Malaga Chuquitaype C, Elghazouli AY, 2017, Design of Timber Structures, Seismic Design Of Buildings To Eurocode 8, Editors: Elghazouli, Pages: 213-234

BOOK CHAPTER

Moharram M, Bompa D, Elghazouli A, 2017, Inelastic assessment of hybrid RC beams to steel column configurations using structural steel shear-keys, Pages: 1336-1343

© Springer International Publishing AG 2018. This study describes experimental and numerical investigations into the inelastic behaviour of hybrid reinforced concrete (RC) beams. The RC beams are connected to steel columns by means of fully embedded structural steel profiles. Observations from a series of ten full-scale hybrid Steel/RC specimens are presented. Nonlinear finite element procedures are carried out and validated against the experimental results from the hybrid tests in this paper. The ability of the numerical models to provide faithful prediction, using a consistent set of material modelling parameters, provides a high level of confidence in the reliability of the simulation techniques. Finally, some simplified analytical representations of the failure surfaces are proposed in which potential failure conditions are predicted and classified in reference to a suggested hybrid Mode Index.

CONFERENCE PAPER

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