Nonlinear FE Modeling of Reinforced Concrete

Dere, Yunus

doi:10.18178/ijscer.6.1.71-74

Cited by 34 publications

(12 citation statements)

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“…[33,34]. ), past applications to steel-concrete composite systems or concrete structural components in general, including other brittle constructional materials like masonry and glass, proved the reliability of qualitative CDP quasi-static estimations (see for example [35][36][37][38][39][40][41]). Assuming a nominal ultimate strain for concrete equal to ε c = 0.0035 [32], in particular, the compressive stress-strain constitutive law for the CDP formulation takes the form:…”

Section: Methodsmentioning

confidence: 99%

Numerical assessment of slab-interaction effects on the behaviour of steel-concrete composite joints

Amadio

Bedon

Fasan

2017

Journal of Constructional Steel Research

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In current design practice for seismic resistant steel braced frames, general rules and standard provisions are\ud aimed to ensure a structural behaviour for beam-to-column joints of non-braced spans as close as possible to\ud perfect hinges. This is done to prevent any kind of interaction with the bracing systems, in particular under\ud horizontal loads. However, the global performance of composite joints is markedly affected by the structural\ud interaction between the concrete slab and the steel components and - especially during seismic events - struts\ud can occur in the slab at the beam-to-column intersection.\ud In this paper, the possibility of realizing a composite joint that behaves as moment-resisting under gravitational\ud loads and essentially as hinged under horizontal loads is investigated. Aiming to assess the actual slab-interaction\ud effects on the overall response, a full 3D Finite Element (FE) model representative of a beam-to-column composite\ud joint taking part of a braced frame is described in ABAQUS and validated towards past full-scale experiments.\ud A parametric study is hence proposed, by accounting for three geometrical configurations, being characterized by\ud (i) isolated slab with absence of rebar continuity (i.e. fully disconnected slab and steel joint only), (ii) presence of\ud slab with partial column interaction (i.e. isolated slab and continuity of rebar), (iii) presence of fully interacting\ud slab. It is shown that, if properly detailed, a joint with isolated slab and continuous rebars can be used in nonbraced\ud spans of composite braced frames without affecting the behaviour of the bracing system (i.e. as in\ud presence of a hinge). Nonetheless, the composite beam can be designed as continuous on multiple supports\ud under vertical loads, hence leading to a reduction of the steel cross-sectional size

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Section: Methodsmentioning

confidence: 99%

Numerical assessment of slab-interaction effects on the behaviour of steel-concrete composite joints

Amadio

Bedon

Fasan

2017

Journal of Constructional Steel Research

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“…Reference source not found., nodes 1, 2, 3, and 4 were debonded nodes, while the others were bonded nodes. The energy release rate of mode I fractures (𝐺 ) for 4-noded elements can be estimated using Equation (11).…”

Section: Virtual Crack Closure Techniquementioning

confidence: 99%

Nonlinear ABAQUS Simulations for Notched Concrete Beams

2021

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The numerical simulation of concrete fracture is difficult because of the brittle, inelastic-nonlinear nature of concrete. In this study, notched plain and reinforced concrete beams were investigated numerically to study their flexural response using different crack simulation techniques in ABAQUS. The flexural response was expressed by hardening and softening regime, flexural capacity, failure ductility, damage initiation and propagation, fracture energy, crack path, and crack mouth opening displacement. The employed techniques were the contour integral technique (CIT), the extended finite element method (XFEM), and the virtual crack closure technique (VCCT). A parametric study regarding the initial notch-to-depth ratio (ao/D), the shear span-to-depth ratio (S.S/D), and external post-tensioning (EPT) were investigated. It was found that both XFEM and VCCT produced better results, but XFEM had better flexural simulation. Contrarily, the CIT models failed to express the softening behavior and to capture the crack path. Furthermore, the flexural capacity was increased after reducing the (ao/D) and after decreasing the S.S/D. Additionally, using EPT increased the flexural capacity, showed the ductile flexural response, and reduced the flexural softening. Moreover, using reinforcement led to more ductile behavior, controlled damage propagation, and a dramatic increase in the flexural capacity. Furthermore, CIT showed reliable results for reinforced concrete beams, unlike plain concrete beams.

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“…For the control specimen (SP7), the bar size for the spiral and tie reinforcement was ⱷ5mm and ⱷ4mm, respectively. This amount of reinforcement, which was based on ABAQUS [24] finite element analysis prior to the experimental work, was provided to prevent the general zone failure, and to allow the failure of the control specimen to occur in the local zone. Similarly, and based on ABAQUS finite element analysis, one closed tie of ⱷ4mm surrounding both anchorage plates was used as spalling reinforcement at the loaded edge for all specimens.…”

Section: Experimental Variablesmentioning

confidence: 99%

Interaction between the Local and General Zone for the Post-tensioned Girder Anchorage Zone

Werdina¹,

Aziz²

2021

TOCIEJ

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Background: The use of post-tensioning in girders causes high bearing and compressive stresses in the anchorage zone. In this study, the behavior of the anchorage zone and the interaction between the local and general zone are investigated. The variables included different reinforcements for both the local and general zones for a block of two anchorage devices. Methods: Both experimental and numerical methods have been applied to study the behavior of the anchorage zone. The experimental part of the study involved laboratory testing of sixteen specimens, and the numerical study was conducted using ABAQUS non-linear finite element analysis. Results: Tie reinforcement provided additional confinement for the local zone, and this confinement was more for the specimens with originally less confined spiral reinforcement strength. There was a slight or no effect of the local zone reinforcement on the general zone strength and ultimate load of the anchorage zone when the failure was in the general zone. Conclusion: Confinement of the local zone prevented the brittle bearing and compression failure of this zone.

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Nonlinear FE Modeling of Reinforced Concrete

Cited by 34 publications

References 0 publications

Numerical assessment of slab-interaction effects on the behaviour of steel-concrete composite joints

Numerical assessment of slab-interaction effects on the behaviour of steel-concrete composite joints

Nonlinear ABAQUS Simulations for Notched Concrete Beams

Interaction between the Local and General Zone for the Post-tensioned Girder Anchorage Zone

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