Probabilistic models for mechanical properties of prestressing strands

Jacinto, Luciano; Pipa, M.; Neves, Luís; Santos, Luís Oliveira

doi:10.1016/j.conbuildmat.2012.04.121

Cited by 17 publications

(7 citation statements)

References 3 publications

(4 reference statements)

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“…deriving from an imperfect initial knowledge [16]) and represented by random variables following appropriate statistical distributions. Several studies provide statistical distributions derived from statistical analysis for parameters affecting the probabilistic structural assessment of existing bridges [8,17,18].…”

Section: Modelling Uncertaintiesmentioning

confidence: 99%

Fragility analysis of prestressed concrete girder bridges to traffic loads considering tendon corrosion

Nettis,

Ruggieri

et al. 2023

ce papers

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The paper is focused on the probabilistic structural assessment of existing prestressed concrete girder bridges accounting for traffic loads. Particularly, this study concerns the fragility of the class of prestressed concrete girder bridges characterized by post‐tensioned tendons built in the 1960‐1970 period. The structural safety of such bridge class can be affected by construction errors involving voids in the ducts and degradation conditions in terms of tendon corrosion which can be hardly detected during on‐site visual inspections. The study applies a fragility analysis algorithm to investigate the probabilistic response under traffic loads considering the uncertainty related to material and geometric variables for different scenarios of tendon corrosion. The algorithm is applied for two typical case‐study configurations of simply supported superstructures. The achieved results can be considered as a basis for future typological studies which can be used as a decision support for transport managers to define risk‐informed refined assessment plans.

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Section: Modelling Uncertaintiesmentioning

confidence: 99%

Fragility analysis of prestressed concrete girder bridges to traffic loads considering tendon corrosion

Nettis,

Ruggieri

et al. 2023

ce papers

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show abstract

“…In the definition of the distribution types and coefficients of variation (COV) for each variable, available bibliography was considered. The steel strand strength model was selected based on the study from Jacinto et al (2012). The CFRP laminates strength model was defined after a probabilistic study by Gomes et al (2018), where the Weibull distribution was shown to be accurate for probabilistic analyses.…”

Section: Probabilistic Modelsmentioning

confidence: 99%

Partial Safety Factors for Prestressed Concrete Girders Strengthened with CFRP Laminates

et al. 2020

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This paper provides a framework for the calibration of partial safety factors in prestressed concrete (PC) girders strengthened in flexure with carbon fibre-reinforced polymer (CFRP) laminates. A hybrid approach was proposed to take advantage of comprehensive non-linear numerical models in reliability analysis using a first order reliability method (FORM) in conjunction to the response surface method (RSM). The PC girders selected for analyses were taken from real structures designed and built since the 1980s, based on old standards, now requiring strengthening and upgrade due to partial corrosion of prestressing strands. Using the proposed approach, a sensitivity analysis was performed to identify the most relevant variables and assess the area of CFRP laminates needed to restore the capacity to new design standards. Following this study, a partial safety factor was proposed for strengthening PC girders using CFRP laminates. A sensitivity analysis also showed the traffic loads and model uncertainties to be the most important variables for calibration.

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“…Additionally, the corrosion variables include the surface chloride concentration, C s , threshold chloride concentration, C th , chloride diffusion coefficient, D cl , concrete cover, c, corrosion rate, i c and corrosion model error, γ ic . Table 1 summarises the models and values for each variable [2,4,5,19,[49][50][51][52][53]. It should be mentioned that other material properties not mentioned in the table below, such as the compressive strength of concrete, cm , are considered deterministic with their average design value since they were shown in a previous study not to be significant for the reliability analyses [54].…”

Section: Random Variablesmentioning

confidence: 99%

Time-dependent reliability analyses of prestressed concrete girders strengthened with CFRP laminates

Dias-da-Costa

Neves

Gomes

et al. 2019

Engineering Structures

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This paper presents a time-dependent reliability analysis of prestressed concrete girders subjected to degradation caused by pitting corrosion. The procedure presented includes the effects of both spatial and temporal pitting corrosions on prestressing steel, as well as the degradation of the strengthening CFRP laminate used for the rehabilitation of the member. Results indicate that the correlation of corrosion in different segments of the prestressing tendons impacts on the computed safety index for the deteriorated structure. Ditlevsen bounds are proposed for a better approximation of the correlation between failure modes in the spatial discretisation. Results show that such approach produces adequate estimates of the reliability index over the full range of analysis in comparison with other tested models. It is also observed that the degradation of the CFRP laminates does not affect the reliability as significantly as corrosion, and that traffic loads, models uncertainties, corrosion error and corrosion rate are the most relevant variables in the analysis, followed by prestressing strength and concrete cover. The significance of the variables changes with time: the corrosion rate, corrosion model error and concrete cover increase in importance with the development of corrosion, whereas traffic loads become gradually less important.

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Probabilistic models for mechanical properties of prestressing strands

Cited by 17 publications

References 3 publications

Fragility analysis of prestressed concrete girder bridges to traffic loads considering tendon corrosion

Fragility analysis of prestressed concrete girder bridges to traffic loads considering tendon corrosion

Partial Safety Factors for Prestressed Concrete Girders Strengthened with CFRP Laminates

Time-dependent reliability analyses of prestressed concrete girders strengthened with CFRP laminates

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