Behaviour of confined rubberised concrete members under combined loading conditions

Bompa, D.V.; Elghazouli, A.Y.

doi:10.1680/jmacr.19.00121

Cited by 11 publications

(9 citation statements)

References 38 publications

(50 reference statements)

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“…The results presented in this study, which has been lacking to date, regarding the fundamental cyclic properties of unconfined RuC materials, show that RuC can be used in expected plastic hinge zones of flexural members. On the other hand, for RRuC members with high axial loads such as column members, external confinement such as using steel tubes or FRP jackets [15,27,36,69,70], are required. However, for detailed numerical modelling of confined RuC, fundamental characteristics of unconfined RuC under cyclic loading are needed as have been quantified in this paper.…”

Section: Unloading Modulus and Residual Strainmentioning

confidence: 99%

Cyclic stress–strain rate-dependent response of rubberised concrete

Bompa

Elghazouli

2020

Construction and Building Materials

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This paper presents an experimental investigation into the constitutive response of rubberised concrete materials under monotonic and cyclic compression. After describing the test specimens and experimental arrangement, a detailed account of the stress-strain response of rubberised concrete materials, as well as their reference high strength conventional concrete, is given. The volumetric rubber content is varied between 0 and 40% of both fine and coarse aggregates. Both monotonic and cyclic loading conditions are considered for comparison, and three strain rate levels, simulating static, moderate and severe seismic action, are examined. The increase in rubber content is shown to have a detrimental effect on the stiffness and strength, as expected. However, with the increase in rubber content, rubberised concrete materials are shown to exhibit improved compressive recovery under cyclic loading, coupled with a higher energy accumulation rate, enhanced inter-cycle stability and lower inter-cycle degradation. It is also shown that the increase in strain rate, from static to severe seismic, leads to a notable increase in the stiffness and strength, with these enhancements becoming less significant with the increase in rubber content. Based on the results and observations, expressions for determining the unloading stiffness and residual strain, as a function of rubber content and strain rate, are proposed within the ranges considered. The suggested relationships enable the characterisation of rubberised concrete materials within widely used cyclic constitutive models.

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Section: Unloading Modulus and Residual Strainmentioning

confidence: 99%

Cyclic stress–strain rate-dependent response of rubberised concrete

Bompa

Elghazouli

2020

Construction and Building Materials

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“…FRP laminates were shown in previous studies to improve the capacity of RuC members under combined compression and bending loading and to provide high rotation capacity compared with RRuC members with internal stirrup confinement [7]. The capacity of FRP-confined RuC was between two to four times higher than unconfined RuC when the rubber content was 30% and 60%, respectively [8].…”

Section: Introductionmentioning

confidence: 95%

Confinement effects for rubberised concrete in tubular steel cross-sections under combined loading

Mujdeci

Bompa

Elghazouli

2021

Archiv.Civ.Mech.Eng

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This paper describes an experimental investigation into confinement effects provided by circular tubular sections to rubberised concrete materials under combined loading. The tests include specimens with 0%, 30% and 60% rubber replacement of mineral aggregates by volume. After describing the experimental arrangements and specimen details, the results of bending and eccentric compression tests are presented, together with complementary axial compression tests on stub-column samples. Tests on hollow steel specimens are also included for comparison purposes. Particular focus is given to assessing the confinement effects in the infill concrete as well as their influence on the axial–bending cross-section strength interaction. The results show that whilst the capacity is reduced with the increase in the rubber replacement ratio, an enhanced confinement action is obtained for high rubber content concrete compared with conventional materials. Test measurements by means of digital image correlation techniques show that the confinement in axial compression and the neutral axis position under combined loading depend on the rubber content. Analytical procedures for determining the capacity of rubberised concrete infilled cross-sections are also considered based on the test results as well as those from a collated database and then compared with available recommendations. Rubber content-dependent modification factors are proposed to provide more realistic representations of the axial and flexural cross-section capacities. The test results and observations are used, in conjunction with a number of analytical assessments, to highlight the main parameters influencing the behaviour and to propose simplified expressions for determining the cross-section strength under combined compression and bending.

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“…The use of recycled rubber particles as partial replacements of both coarse and fine aggregates in concrete is considered a sustainable solution to reduce the detrimental impact of rubber waste on the environment [1][2][3]. RuC can be an efficient alternative to conventional concrete materials (CCM) for some applications, although RuC is characterised by a low elastic modulus, compressive capacity and tensile strength in comparison with CCM [4][5][6][7][8]. Rubberised concrete (RuC) has the potential for being used in structural applications and has good performance in terms of ductility, energy dissipation, durability, and sound insulation [9][10][11].…”

Section: Introductionmentioning

confidence: 99%