Evaluation of safety formats for non-linear finite element analyses of statically indeterminate concrete structures subjected to different load paths

Blomfors, Mattias; Engen, Morten; Plos, Mario

doi:10.1002/suco.201500059

Cited by 24 publications

(9 citation statements)

References 10 publications

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“…These values can be eventually fine-tuned to calibrate the outcomes. It is noteworthy that, for specific constructions, can be calibrated through Finite Element Method (FEM) analyses as noticed by Vamvatsikos and Cornell 76 and as carried out by several authors, notably, Schlune et al 77 , Cervenka 78 , Allaix et al 79 , Belletti et al 80 , Pimentel et al 81 , Blomfors et al 82 , Castaldo et al 83 , although this is beyond the scope of this study, which is to provide a general procedure for defining seismic target risk in Europe.…”

Section: Application To Europe For Peak Ground Accelerationsmentioning

confidence: 99%

Towards risk-targeted seismic hazard models for Europe

Monti

Demartino

Gardoni

2023

Sci Rep

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Standards and Codes of Practice for designing new constructions and for assessing and strengthening existing ones are usually based on uniform hazard maps, where different Limit States (LSs) are associated with different hazard-exceedance probabilities. This approach yields non-homogeneous LS-exceedance probabilities across a territory, thus failing to achieve the goal of uniform risk throughout a territory. Such lack of uniformity stems from estimating the probability of failure using capacity and demand models. If the capacity of new constructions—or the capacity increase of strengthened existing constructions—are designed based on a prescribed hazard-exceedance probability, then the seismic risk depends on both the structure (depending on the design philosophy and corresponding design objectives), through the capacity model, and the location, through the hazard model. The aim of this study is threefold. First, it provides a seismic probability assessment formulation and a risk-targeted intensity measure based on a linear model in log–log coordinates of the hazard, under the assumption of log-normal capacity and demand. The proposed framework introduces a factor that multiplies the code hazard-based demand to account either for intentional (from design) over-capacity or for undesired (e.g., in existing constructions) under-capacity. Second, this paper shows an application to peak ground accelerations in Europe considering parameters taken from Standards and Codes of Practice. The developed framework is used to determine the risk-target levels of peak ground acceleration used for design in Europe, for both new and existing constructions. Third, the obtained target risk levels are used to determine a risk-based intensity modification factor and a risk-based mean return period modification factor, which can be readily implemented in current Standards to achieve risk-targeted design actions, with equal LS-exceedance probability across the territory. The framework is independent of the chosen hazard-based intensity measure, be it the commonly used peak ground acceleration or any other measure. The results highlight that in large areas of Europe the design peak ground acceleration should be increased to achieve the proposed seismic risk target and that this is particularly significant for existing constructions, given their larger uncertainties and typical low capacity with respect to the code hazard-based demand.

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Section: Application To Europe For Peak Ground Accelerationsmentioning

confidence: 99%

Towards risk-targeted seismic hazard models for Europe

Monti

Demartino

Gardoni

2023

Sci Rep

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“…A plasticity-based model (Lantsoght et al 2017b, Lantsoght et al 2017c) has been proposed to estimate the maximum load on a reinforced concrete slab bridge, but this method has the disadvantage that the calculation needs to be tailored to the geometry of the bridge under consideration. Nonlinear finite element models (Falbr 2011) combined with the appropriate safety formats (Schlune 2011, Belletti et al 2013, Blomfors et al 2016) can be used for the assessment of existing reinforced concrete slab bridges, but this approach is quite time-consuming (Shu et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Neural network-based formula for shear capacity prediction of one-way slabs under concentrated loads

Abambres,

2024

Preprint

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According to the current codes and guidelines, shear assessment of existing reinforced concrete slab bridges sometimes leads to the conclusion that the bridge under consideration has insufficient shear capacity. The calculated shear capacity, however, does not consider the transverse redistribution capacity of slabs, thus leading to overconservative values. This paper proposes an artificial neural network (ANN)-based formula to come up with estimates of the shear capacity of one-way reinforced concrete slabs under a concentrated load, based on 287 test results gathered from the literature. The proposed model yields maximum and mean relative errors of 0.0% for the 287 data points. Moreover, it was illustrated to clearly outperform (mean V / V =1.00) the Eurocode 2 provisions (mean V / V =1.59) for that dataset. A step-by-step assessment scheme for reinforced concrete slab bridges by means of the ANN-based model is also proposed, which results in an improvement of the current assessment procedures.

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“…Comprehensive deliberations concerning the global safety formats for the NLFEA of RC structures are available within the references [40,43,44]. Castaldo et al [35] explored the impact of aleatory uncertainty and the sensitivity of the numerical model in accurately predicting failure modes and their subsequent effects on NLFEA results in terms of reliability.…”

Section: Introductionmentioning

confidence: 99%

Global Resistance Methods for the Design of Fiber-Reinforced Concrete (FRC) Beams with Material Nonlinear Finite Element Analysis

Shahrbijari,

Barros,

Valente

2023

Buildings

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This article explores the application of the global resistance methods (GRMs) on the design of hybrid glass fiber-reinforced polymer (GFRP) and steel fiber-reinforced concrete (SFRC) beams. Addressing challenges posed by GFRP-reinforced beams, this study aims to assess the impact of material uncertainties on the behavior of such hybrid beams. The investigation involves the experimental testing of I-shaped SFRC beams, which are used to develop and validate nonlinear finite element analysis (NLFEA) models. These models incorporate material non-linearities while minimizing uncertainties related to modeling assumptions. Through the application of GRM, the study evaluates the global resistance safety factor, offering insights into the structural performance of hybrid reinforcement SFRC beams. Ultimately, this research seeks to facilitate a transition from traditional localized approaches to more accurate and comprehensive analyses for the design of hybrid reinforcement SFRC beams, contributing to the advancement of structural engineering by promoting safer, more resilient, and sustainable construction systems.

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Evaluation of safety formats for non-linear finite element analyses of statically indeterminate concrete structures subjected to different load paths

Cited by 24 publications

References 10 publications

Towards risk-targeted seismic hazard models for Europe

Towards risk-targeted seismic hazard models for Europe

Neural network-based formula for shear capacity prediction of one-way slabs under concentrated loads

Global Resistance Methods for the Design of Fiber-Reinforced Concrete (FRC) Beams with Material Nonlinear Finite Element Analysis

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