Time‐dependent cyclic behavior of reinforced concrete bridge columns under chlorides‐induced corrosion and rebars buckling

Pelle, Angelo; Briseghella, Bruno; Bergami, Alessandro Vittorio; Fiorentino, Gabriele; Giaccu, Gian Felice; Lavorato, Davide; Quaranta, Giuseppe; Rasulo, Alessandro; Nuti, Camillo

doi:10.1002/suco.202100257

Cited by 39 publications

(18 citation statements)

References 55 publications

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“…Considering an initial value of cover thickness equal to 25 mm, the iterative process has been developed for different concrete type. In this work the cover thickness of the longitudinal reinforcements is calculated considering the presence of the stirrups [47].…”

Section: Corrosion Effects and Structural Modellingmentioning

confidence: 99%

Maintenance interventions period of existing RC motorway viaducts located in moderate/high seismicity zones

et al. 2023

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Section: Corrosion Effects and Structural Modellingmentioning

confidence: 99%

Maintenance interventions period of existing RC motorway viaducts located in moderate/high seismicity zones

et al. 2023

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“…7. Figure 8a shows the time-dependent evolution of the chloride-induced corrosion, expressed as the loss of reinforcement section or the ratio between corroded section A pt and original bar section A' s , predicted from multiphysics FE-based simulations for each intervention methodology [44]. As regards the first option, the replacement of the pier with a new one designed as the original without providing for a regulatory adaptation, there will be a loss of the reinforcement area after 50 years of about 11%.…”

Section: Indicators Descriptionmentioning

confidence: 99%

The greenway for bridge column rehabilitation: a comparison between different techniques based on multi-criteria decision analysis

Briseghella

Borghese

Contiguglia

et al. 2022

Rev. IBRACON Estrut. Mater.

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One of the biggest issues in civil engineering is the poor performance of concrete repairs. In fact, in Europe only 50% of concrete structures restorations are estimated to be successful, even though rehabilitation costs account for about half of the yearly construction budgets. This research aims at investigating a potential green approach to the sustainability of rehabilitation solutions for infrastructures. Following a simplified analysis of C02 emissions, intervention costs, social aspects, structural performances and other variables considered relevant to the scope, possible rehabilitation techniques are compared and ranked. The following four different options have therefore been designed to be applied to an actual column of the Brabau Bridge in Sardinia (Italy): i. complete removal and replacement of the column, ii. replacement of the damaged longitudinal rebars by machined bars and ultra-high performance fibre-reinforced concrete (UHPFRC) strengthening, iii. longitudinal and transverse fiber reinforced polymers (FRP) wrapping, iv. concrete jacketing. A methodological and procedural strategy is established through multi-criteria analysis that will allow future developments to assess the whole Life Cycle Assessment of the maintenance work.

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“…Corrosion of reinforcing steel may be addressed as one of the most popular causes of damage to reinforced concrete and prestressed concrete (PC) structural members. [1][2][3][4] In this regard, in the last decades seismic performance of bridges has been extensively studied, involving a number of topics such as nonlinear modeling, performance-based design, probabilistic assessment, and structural fragility. [5][6][7][8] During the last few years, a growing interest has been paid in firstorder reliability methods for safety assessment of existing bridges.…”

Section: Introductionmentioning

confidence: 99%

Fragility analysis of existing prestressed concrete bridges under traffic loads according to new Italian guidelines

Miluccio

Losanno

Parisi

et al. 2022

Structural Concrete

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After the 2018 collapse of Morandi highway bridge in Genova, new Italian guidelines (GL) were issued for prioritization of safety evaluations and retrofit interventions on existing bridges. Among several novelties, GL introduced new traffic load models (TLMs) which can be adopted for existing bridges in case of noncompliant safety checks according to the Italian building code (NTC) provisions. In this study, a class of simply supported, beam-type, prestressed concrete bridge decks built between 1970 and 1980 in Italy is considered. Assuming geometric, material, and load random variables together with consideration of capacity model uncertainty, Monte Carlo sampling technique was implemented in MATLAB in order to randomly generate deck models and to evaluate their traffic-load fragility. Fragility analysis was carried out to compare vulnerability levels of existing Italian bridges under different load patterns provided by GL and NTC. In addition to a prescribed TLM, the sensitivity of fragility to bridge usage limitations, such as reduced distance of external load lane from kerb or reduced number of lanes, was also quantified to support decision-making by road management companies. In the final part of the study, the annual failure probability of selected bridges was estimated using a European weigh-in-motion database and convolution of fragility and hazard.Abbreviations: A sp , prestressing steel area; A s , reinforcing steel area; b w , girder web width; CoV, coefficient of variation; d, distance of reinforcing steel rebar from the top compression side; DCR, demand capacity ratio; f ct , concrete tensile strength; FORM, first order reliability method; GL, Italian technical Guidelines for safety assessment of existing bridges; GVW, gross vehicle weight; IM, intensity measure; LRFD, load-resistance factor design; M r , flexural capacity; M r,exp , experimental flexural strength; M r,th , theoretical flexural strength; n l , number of notional lanes; N sim , number of simulations; NTC, Italian building code; P[C], failure probability; P[CjH], conditional probability of exceeding ultimate limit state given intensity measure; P[H], traffic-related hazard; PC, prestressed concrete; PSD, permissible stress design; Q 1d , design first-lane tandem load; R 2 , coefficient of determination; RC, reinforced concrete; r l , remaining area of the carriageway width; RV, random variable; TLM, traffic load model; t ref , residual service life; ULS, ultimate limit state; V r , shear capacity; WIM, weigh-in-motion; x 0 , clear distance of the first notional lane from the kerb; β, logarithmic standard deviation; β 0 , target reliability; β al , logarithmic standard deviation associated with aleatory uncertainties; β ep , logarithmic standard deviation associated with epistemic uncertainties; μ, mean value; σ cp , average compressive concrete stress; σ sp , residual prestressing action; θ, model error.Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print,...

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Time‐dependent cyclic behavior of reinforced concrete bridge columns under chlorides‐induced corrosion and rebars buckling

Cited by 39 publications

References 55 publications

Maintenance interventions period of existing RC motorway viaducts located in moderate/high seismicity zones

Maintenance interventions period of existing RC motorway viaducts located in moderate/high seismicity zones

The greenway for bridge column rehabilitation: a comparison between different techniques based on multi-criteria decision analysis

Fragility analysis of existing prestressed concrete bridges under traffic loads according to new Italian guidelines

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