Constitutive Model for Rubberized Concrete Passively Confined with FRP Laminates

Raffoul, Samar; Escolano‐Margarit, David; Garcia, Reyes; Guadagnini, Maurizio; Pilakoutas, Kypros

doi:10.1061/(asce)cc.1943-5614.0000972

Cited by 20 publications

(24 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

“…Importantly, most reported tests on the cyclic compressive response of RuC have been limited to rubber content levels below 30%, as a replacement of fine mineral aggregates, which corresponds to a relatively low rubber content of around 11% of the total mineral aggregates [26][27][28][29]. Limited studies, on the other hand, investigated the elastic mechanical properties of RuC with relatively high rubber content under cyclic compression or flexural loads [30][31][32][33][34][35][36][37]. However, the fundamental post-peak characteristics of unconfined RuC materials with relatively high rubber content under cyclic compression have not been investigated.…”

Section: Introductionmentioning

confidence: 99%

“…Conventional concrete materials (CCM) are characterised by stiff inclusions, mineral aggregates, in a soft cementitious matrix separated by weak ITZs. Debonding and slip between the inclusions and matrix during cyclic loading, as well as cracks and shear bands in the matrix and inclusions, can contribute to and aggravate the degradation in CCM materials [36][37][38]. On the other hand, for RuC, particularly when a high rubber content is used, the weaker components would be the rubber particles, and fracture and post-peak degradation would be governed by the rubbermatrix interactions.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cyclic stress–strain rate-dependent response of rubberised concrete

Bompa

Elghazouli

2020

Construction and Building Materials

View full text Add to dashboard Cite

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.

show abstract

Section: Unloading Modulus and Residual Strainmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cyclic stress–strain rate-dependent response of rubberised concrete

Bompa

Elghazouli

2020

Construction and Building Materials

View full text Add to dashboard Cite

show abstract

“…External confinement, such as using fibre-reinforced polymer (FRP), provides a viable approach to recover some or all of the strength loss due to the presence of rubber [6]. 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: 99%

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

Mujdeci

Bompa

Elghazouli

2021

Archiv.Civ.Mech.Eng

View full text Add to dashboard Cite

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.

show abstract

“…With regard to FRP confined RuC, existing studies showed that FRP sheets have a significant influence on the structural behaviour of RuC members, including the load carrying capacity and the rotation capacity [8,9]. RuC members using FRP laminates can provide from two to four times higher strength compared with unconfined RuC counterparts [7,10].…”

Section: Introductionmentioning

confidence: 99%

Structural performance of composite steel rubberised concrete members under combined loading conditions

2021

View full text Add to dashboard Cite

This paper investigates the structural behaviour of rubberised concrete‐filled steel tubular (RuCFST) members under a wide range of axial‐bending loading conditions. The results of an experimental programme on circular concrete‐filled steel tubes (CFST), incorporating conventional and rubberised concrete (RuC) materials with various rubber content ratios, are presented. After describing the specimen details and testing arrangements, the influence of the RuC infill on the behaviour of test members in terms of moment‐axial interaction and ductility, is examined. The test results show that whilst the cross‐sectional capacity of RuCFST members is reduced with the increase in rubber content, significantly higher ductility is obtained compared with conventional counterparts. An enhancement of about 85% in ductility is obtained for members with 60% rubber content compared to those with conventional concrete. Finally, the test results are compared with current design guidelines, indicating that the latter tend to overestimate the capacity, particularly for relatively high rubber contents.

show abstract

Constitutive Model for Rubberized Concrete Passively Confined with FRP Laminates

Cited by 20 publications

References 39 publications

Cyclic stress–strain rate-dependent response of rubberised concrete

Cyclic stress–strain rate-dependent response of rubberised concrete

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

Structural performance of composite steel rubberised concrete members under combined loading conditions

Contact Info

Product

Resources

About