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

263 results found

Bompa DV, Elghazouli AY, 2019, Inelastic cyclic behaviour of RC members incorporating threaded reinforcement couplers, ENGINEERING STRUCTURES, Vol: 180, Pages: 468-483, ISSN: 0141-0296

JOURNAL ARTICLE

Bravo-Haro MA, Elghazouli AY, 2018, Influence of earthquake duration on the response of steel moment frames, SOIL DYNAMICS AND EARTHQUAKE ENGINEERING, Vol: 115, Pages: 634-651, ISSN: 0267-7261

JOURNAL ARTICLE

Bompa DV, Elghazouli AY, 2018, Elevated temperature characteristics of steel reinforcement incorporating threaded mechanical couplers, Fire Safety Journal, ISSN: 0379-7112

JOURNAL ARTICLE

Bompa DV, Elghazouli AY, 2018, Monotonic and cyclic performance of threaded reinforcement splices, Structures, Vol: 16, Pages: 358-372, ISSN: 2352-0124

This paper examines the fundamental uniaxial monotonic and cyclic response of reinforcement bars connected with threaded mechanical couplers. Based on a survey of available splicing forms, two types of threaded couplers with different geometric configurations, namely ‘parallel threaded couplers’ and ‘parallel threaded sleeve couplers’ are selected for detailed assessment. An experimental study consisting of twenty-four bare (in-air) and embedded (in-concrete) specimens incorporating threaded couplers and non-spliced counterparts, is described. The results enable direct assessment of strength as well as complete deformation characteristics, including the post-cracking and post-yield response, for both monotonic and cyclic conditions. After describing the material properties and specimen details, the main observations are reported based on detailed measurements of crack kinematics including crack width and spacing through a digital image correlation system. Complementary numerical studies, undertaken using nonlinear finite element procedures which are validated against the tests, enabled supplementary parametric investigations accounting for wider ranges of coupler geometries. The findings show that existing guidelines may be used for assessing the crack width and spacing, by accounting for the characteristic bond behaviour at the rebar and coupler regions. The complete deformational response may be obtained by using a suggested stiffness reduction factor that depends on the coupler geometry. Several ‘in-air’ performance parameters may also be used as a basis for the selection and implementation of couplers in applications requiring ductile member behaviour.

JOURNAL ARTICLE

Bravo-Haro MA, Tsitos A, Elghazouli AY, 2018, Drift and rotation demands in steel frames incorporating degradation effects, BULLETIN OF EARTHQUAKE ENGINEERING, Vol: 16, Pages: 4919-4950, ISSN: 1570-761X

JOURNAL ARTICLE

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

JOURNAL ARTICLE

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

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

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

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

CONFERENCE PAPER

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

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

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

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

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

REPORT

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

Xu B, Bompa DV, Elghazouli AY, Ruiz-Teran AM, Stafford PJet al., 2017, Behaviour of rubberised concrete members in asymmetric shear tests, Construction and Building Materials, Vol: 159, Pages: 361-375, ISSN: 0950-0618

This paper deals with the experimental behaviour of rubberised concrete members subjected to asymmetric four-point shear loading. A detailed account of tests on 15 prismatic members using conventional concrete as well as rubberised concrete, with relatively high replacement ratios of both fine and coarse mineral aggregates with rubber particles, is given. The results enable direct assessment of strength and complete deformation characteristics including the post-peak response for ultimate behaviour governed both by shear and mixed-mode tensile-shear. After describing the material properties, mix designs and member details, the main observations from detailed measurements of the crack kinematics through a digital image correlation monitoring system, with focus on members developing shear-governed response, are reported. Complementary numerical studies are undertaken using nonlinear finite element procedures which are validated against tests developing shear-governed failures. In order to provide further insight into the key response characteristics, particularly those related to ultimate strength, a number of numerical sensitivity studies employing various constitutive parameters are also carried out. Moreover, comparative assessments in terms of shear resistance, toughness and force transfer across the cracked interfaces are performed and discussed. The detailed test measurements, coupled with the results obtained from the numerical simulations, permit the definition of expressions for representing the shear resistance as a function of the rubber content and concrete compressive strength.

JOURNAL ARTICLE

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

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

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

CONFERENCE PAPER

Moharram MI, Bompa DV, Elghazouli AY, 2017, Performance and Design of Shear Keys in Hybrid RC Beam and Steel Column Systems, Eurosteel2017

CONFERENCE PAPER

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

CONFERENCE PAPER

Salawdeh S, English J, Goggins J, Elghazouli AY, Hunt A, Broderick BMet al., 2017, Shake table assessment of gusset plate connection behaviour in concentrically braced frames, Journal of Constructional Steel Research, Vol: 138, Pages: 432-448, ISSN: 0143-974X

Diagonal bracing members and their connections to beams and columns are the key lateral resisting components in concentrically braced frames (CBFs). Although gusset plate connections are widely used to connect bracing and frame members in such systems, their design often involves significant simplifications and idealisations due to the complexity of their behaviour under seismic loading. A conventional approach, which utilises a standard linear clearance zone that permits out-of-plane brace deformation, is typically used in the design of gusset plates. This approach can result in overly large connections with cumbersome details. The desire to achieve an improved balance between the gusset over-strength, on the one hand, and a favourable overall frame performance coupled with practical connection detailing, on the other, has prompted proposals for an improved design approach. However, before new recommendations on the design of gusset plate connections can be provided for use in codified guidance, there is a need to assess the performance of such detailing alternatives under realistic earthquake loading conditions. Accordingly, in this study, the performance of different brace connection configurations and gusset plate designs are examined using shake table testing. The paper describes twelve single-storey full scale shake table tests, which were performed on the AZALEE seismic testing facility at CEA Saclay. In seven of these tests, the gusset plates at the end of the brace members were connected to both beam and column flanges, while in the other five tests these were connected to the beam flange only. Conventional gusset plate design with a standard linear clearance was used for six tests, whereas a more balanced design with a nonlinear elliptical clearance detail was used for the others. The experimental set-up, specimen details, and loading procedures are presented, together with a detailed account of the results and observations. The main findings and their imp

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, 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

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

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

Moharram MI, Bompa DV, Elghazouli AY, 2017, Experimental and numerical assessment of mixed RC beam and steel column systems, JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH, Vol: 131, Pages: 51-67, ISSN: 0143-974X

JOURNAL ARTICLE

Moharram MI, Bompa DV, Elghazouli AY, 2017, Inelastic Assessment of Hybrid Reinforced Concrete Assemblages, fib Symposium 2017, Pages: 1336-1343

CONFERENCE PAPER

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