Model Uncertainty for Shear Resistance of Reinforced Concrete Beams With Shear Reinforcement According to en 1992-1-1

Sýkora, Milan; Holický, Milan; Krejsa, Jan

doi:10.2478/tvsb-2013-0022

Cited by 12 publications

(17 citation statements)

References 2 publications

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“…These conclusions are confirmed by a more recent study of the authors where a significant trend of l h with q w f yw is observed (Table 3). Figure 2 adapted from [47] shows variation of h with q w f yw and the trend of the mean value of h based on an exponential regression. The influence of the strength of shear reinforcement on the coefficient of variation of the model uncertainty is less significant.…”

Section: Uncertainties In Models Provided In En 1992-1-1: Sound Strucmentioning

confidence: 99%

“…As an example the database in [9] consisted of beams without shear reinforcement with the following dimensions: d * 102-1,090 mm, d / b w * 0.37-7.17 and a / d * 2.48-7.86. The database accepted by [47] included beams with stirrups with the following dimensions: b w * 76-457 mm, d * 95-1,200 mm, s * 48-600 mm and a / d * 2. 49-5.40.…”

Section: Uncertainties In Models Provided In En 1992-1-1: Sound Strucmentioning

confidence: 99%

“…Variation of h with q w f yw and the exponential trend of l h for shear resistance of members with shear reinforcement (adapted from[47])…”

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confidence: 99%

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Uncertainties in resistance models for sound and corrosion-damaged RC structures according to EN 1992-1-1

et al. 2014

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Resistance of civil engineering structures is primarily dependent on material properties, geometry and uncertainties related to an applied model. While materials and geometry can be relatively well described, the resistance model uncertainty is not yet well understood. The present paper improves the general concept for the model uncertainty from the Probabilistic model code of the Joint Committee on Structural Safety. Influences affecting results obtained by tests and models and effects of actual structural conditions are overviewed. Statistical characteristics of the uncertainties in resistance of reinforced concrete members are then provided considering simple engineering formulas based on EN 1992-1-1 models and effects of deterioration. To facilitate practical applications the partial factors for the model uncertainties are derived using a semi-probabilistic approach. It appears that the model uncertainties are substantial for shear resistances while they are less significant for the well-established models used for bending resistance and axial compression without buckling. Uncertainty in test procedures seems to be less important in common cases. The effect of the resistance uncertainties on structural reliability seems to be more significant for corrosion-damaged structures than for sound structures. Consequently the quantification of the model uncertainties is a key issue when assessing corrosion-damaged reinforced concrete structures. Further research should be focused on model uncertainties related to the models for shear and corrosion-damaged structures considering the fib Model Code 2010.

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Section: Uncertainties In Models Provided In En 1992-1-1: Sound Strucmentioning

confidence: 99%

Section: Uncertainties In Models Provided In En 1992-1-1: Sound Strucmentioning

confidence: 99%

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Uncertainties in resistance models for sound and corrosion-damaged RC structures according to EN 1992-1-1

et al. 2014

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“…The general methodology is derived from previous investigations where the relative importance of model uncertainty was assessed, as based on the compilation of extensive test datasets. Various investigations on the shear resistance of structural concrete confirmed the importance of model uncertainty and quantified probability models for θ [18][19][20][21][22]. In contrast the results of an investigation on flexural resistance [23] indicated excellent agreement between the results from the design models of various design standards, but nevertheless indicating model bias and dispersion that could not be neglected.…”

Section: Outline Of Methodologymentioning

confidence: 83%

“…When the correlation between θ and {X, Y} is statistically insignificant, variations in model uncertainty are not explainable by systematic variations in the variables X and Y and the assumption on a random variable model of θ appears reasonable. See Ref [10,18]. for examples.…”

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confidence: 98%

Assessment of model uncertainties for structural resistance

Holický

Retief

Sýkora

2016

Probabilistic Engineering Mechanics

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121

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Probabilistic studies on mechanics‐based shear capacity models for reinforced concrete beams with stirrups

Jayakumar

Kanchi

2019

Structural Concrete

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The efficiency of shear capacity models of reinforced concrete beams with stirrups depends on the assumed mechanism and in few cases depends also on critical shear crack angle prediction. In the present study, three mechanics‐based shear capacity models (the limit analysis‐based models presented by Nielsen and Hoang, and the Mari et al. model) are considered covering the range space of shear span to effective depth ratios greater than 2.5. The statistics of modeling error associated with these models are determined using the database created in this study. The database contains limited results of experimental investigations, available in literature, on shear capacity of reinforced concrete beams with stirrups. The randomness in shear capacity is quantified by performing probabilistic analysis of one set of nominally similar beams taken from the database. Based on the shear capacity distribution obtained, characteristic design equations of reinforced concrete beams are proposed. The results of reliability analyses show that the reliability of a beam, for a given mean live to dead load ratio, varies when different shear capacity models are used in the analysis. Thus, calibration studies need to be performed for selecting a model for design.

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Model Uncertainty for Shear Resistance of Reinforced Concrete Beams With Shear Reinforcement According to en 1992-1-1

Cited by 12 publications

References 2 publications

Uncertainties in resistance models for sound and corrosion-damaged RC structures according to EN 1992-1-1

Uncertainties in resistance models for sound and corrosion-damaged RC structures according to EN 1992-1-1

Assessment of model uncertainties for structural resistance

Probabilistic studies on mechanics‐based shear capacity models for reinforced concrete beams with stirrups

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