Material and geometric nonlinear analysis of reinforced concrete frames

Parente, Evandro; Nogueira, Geovanne Viana; Neto, Marcelo Meireles; Moreira, Leandro Soares

doi:10.1590/s1983-41952014000500009

Cited by 5 publications

(5 citation statements)

References 7 publications

(11 reference statements)

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“…Figure 7 shows the horizontal displacement in left corner on the top of the column as a function of the eccentric vertical force. The results are quite close to the experimental procedure developed by Espion (1993) and the numerical results presented by Parente Junior et al (2014) and Matias, Parente Junior and Araújo (2017). While the experimental maximum force was 450.19 kN, the proposed formulation achieved 210 454.00 kN, a difference of only 0.82%.…”

Section: Verification the Mechanical Modelsupporting

confidence: 87%

“…For steel rebars, a linear elastic, perfectly plastic model with 𝐸 = 21000 kN/cm , 𝜈 = 0.30, 𝑓 = 46.50 kN/cm and 𝑘 = 0 were adopted. For Mazars` damage model, the parameters were calibrated using Equation 18and 19, following stress-strain curves presented by Parente Junior et al (2014), according to Eurocode 2 (COMITÉ…, 2004). The following set of parameters were obtained: 𝜀 = 8.65 x 10 -5 , 𝐴 = 0.50, 𝐵 = 9000, 𝐴 = 1.20 and 𝐵 = 1500.…”

Section: Verification the Mechanical Modelmentioning

confidence: 99%

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Numerical analysis of reinforced concrete beam subject to pitting corrosion

Ramos

Carrazedo

2022

Ambient. constr.

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This paper presents a numerical study about the effects of chloride-induced corrosion on the service life of structures. A two-dimensional geometrically nonlinear mechanical model based on Finite Element Method (FEM) was developed for reinforced concrete structures. The corrosion initiation stage was evaluated by Fick's diffusion laws. The corrosion propagation was carried out by deterministic models based on Faraday's law. Pitting corrosion was simulated in the reinforcements by pit elements, distributed longitudinally on the steel rebars, which degrade the physical properties over time. The service life was determined by the crack width.Two parametric analyses were performed. In the first analysis, five models were created with a variablecover thickness and water/cement ratio (w/c). In the second analysis, the reduction in yield stress due to corrosion was considered.The results showed that the concrete cover thicknessand the w/c ratio significantly influence the service life. The reduction of the cover thickness from 30 mm to 25 mm resulted in 21.26% reduction in service life, whilethe increase in the w/c ratio from 0.50 to 0.55 caused 32.98% reduction in service life of the structural element analyzed.

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Section: Verification the Mechanical Modelsupporting

confidence: 87%

Section: Verification the Mechanical Modelmentioning

confidence: 99%

Numerical analysis of reinforced concrete beam subject to pitting corrosion

Ramos

Carrazedo

2022

Ambient. constr.

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“…Due to the material nonlinearity of the concrete and rebars, the cross-section generalized stresses (σ ) and tangent constitutive matrix (C T ) should be evaluated using appropriate procedures, as the fiber method for path-dependent materials or special integration techniques for nonlinear elastic materials [22][23][24]. Integration on the element length is carried out using Gauss or Lobatto rules.…”

Section: Frame Elementmentioning

confidence: 99%

Nonlinear finite element simulation of unbonded prestressed concrete beams

Moreira

Sousa

Parente

2018

Engineering Structures

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“…The latter is the method that was used in this work. The disadvantage of these methods is the high computational cost, as already observed by Parente Jr et al [17] even in portico analysis, and the need for detailed discretization of the finite element mesh in critical regions as can be seen in Marasca et al [18]. All this makes these advanced methods little used in projects, but they are mandatory for advanced research studies, especially when comparisons are made with experimental tests.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of torsional tangent rigidity of reinforced concrete waffle slab

Nunes

2019

Rev. IBRACON Estrut. Mater.

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ResumoThis research work deals with the analysis of torsional tangent rigidity of reinforced concrete waffle slabs by comparisons of the numerical analysis with results of experimental tests, with calculations performed using the ATENA program. This program was specially developed for the calculation of reinforced concrete structures, considering the physical and geometric nonlinear analysis using the finite element method. Numerical analysis considered the tensile strength of the concrete and consequently the fracture energy. Numerical situations were tested to obtain the calibration of the numerical analysis with the laboratory tests. After the calibrations, the results were extrapolated to extreme situations to infer tangent torsion rigidity in new situations. It is concluded that, for waffle slabs, near the rupture, the torsional tangent rigidity should be 5% of the torsional tangent rigidity to the initial torsion. In service, considering one third of the total breaking load, the torsional tangent rigidity should be 85% of the torsional tangent rigidity to the initial twist. This great torsional tangent rigidity in service is another parameter that guarantees the structural efficiency of the waffle slabs and can be used in the most diverse applications of structural engineering.Keywords: reinforced concrete waffle slab, torsional tangent rigidity, numerical analysis.Este trabalho de investigação científica aborda a análise da rigidez tangente à torção de lajes nervuradas de concreto armado por meio de comparações da análise numérica com resultados de ensaios experimentais, cujo cálculo foi feito no programa ATENA. Tal programa foi desenvolvido especialmente para cálculo de estruturas de concreto armado considerando de forma ampla a análise não linear física e geométrica com uso do método dos elementos finitos. As analises numéricas levaram em consideração a resistência à tração do concreto e consequentemente a energia de fratura. Diversas situações numéricas foram testadas para se obter a calibragem da análise numérica com os ensaios de laboratório. Após as calibragens, os resultados foram extrapolados para as situações extremas para se inferir sobre a rigidez tangente à torção em novas situações. Conclui-se que, para lajes nervuradas, nas proximidades da ruptura, a rigidez tangente à torção deve ser 5% da rigidez tangente à torção inicial. Em serviço, considerando um terço da carga total de ruptura, a rigidez tangente à torção deve ser 85% da rigidez tangente à torção inicial. Essa grande rigidez tangente à torção em serviço é mais um parâmetro que garante a eficiência estrutural das lajes nervuradas, podendo ser usadas nas mais diversas aplicações arrojadas de engenharia estrutural.Palavras-chave: laje nervurada de concreto armado, rigidez tangente à torção, análise numérica.

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Material and geometric nonlinear analysis of reinforced concrete frames

Cited by 5 publications

References 7 publications

Numerical analysis of reinforced concrete beam subject to pitting corrosion

Numerical analysis of reinforced concrete beam subject to pitting corrosion

Nonlinear finite element simulation of unbonded prestressed concrete beams

Numerical analysis of torsional tangent rigidity of reinforced concrete waffle slab

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