Numerical evaluation of the corrosion effects in prestressed concrete beams without shear reinforcement

Belletti, Beatrice; Vecchi, Francesca De; Bandini, Cecilia; Andrade, Carmen; Montero, Javier Sánchez

doi:10.1002/suco.201900283

Cited by 39 publications

(35 citation statements)

References 30 publications

(77 reference statements)

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“…For the reinforcement, one‐dimensional fully embedded reinforcement was applied for which perfect bond between the reinforcement and the neighboring concrete elements was assumed. This assumption can be justified by the work of Belletti et al, 21 who found that a model without a bond‐slip relation is able to give a good approximation of the load–displacement curve and the localization of failure. Nonlinear material properties were assigned to these reinforcement elements.…”

Section: Finite Element Modelingmentioning

confidence: 97%

Assessment of posttensioned concrete beams from the 1940s: Large‐scale load testing, numerical analysis and Bayesian assessment of prestressing losses

Botte

Vereecken

Taerwe

et al. 2021

Structural Concrete

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The UCO textile factory was built in Ghent (Belgium) in the period 1947–1948. The roof structure covered an area of about 35,000 m2 and consisted of 100 primary beams and 600 secondary beams. These post‐tensioned beams were designed by prof. Gustave Magnel, who was a world‐leading expert in the field of prestressed concrete. This project was one of the first important large‐scale applications of prestressed concrete in industrial buildings in the world and also the first large scale application of on site prefabrication. Recently, part of the factory building was demolished and a primary beam and secondary beam of the roof structure were transferred to the Magnel‐Vandepitte Laboratory for Building Materials and Structures for testing at an age of approximately 70 years. The primary beams have a span of 20.5 m and a maximum depth of 1.7 m. The secondary beams have a span of 13.7 m and a depth of 1 m. Only prestressing tendons (Blaton–Magnel system with Ø 5 mm wires) were present in the beams but no passive reinforcement nor stirrups are present except for the reinforcement in the corbels and the end blocks. This article describes the results of the loading tests up to failure on the beams. The experimental results are compared with results from analytical calculations. Furthermore, a nonlinear finite element model was developed and validated. Subsequently, this numerical model was used for a Bayesian‐based assessment of the prestressing losses in these beams. As such, the article presents novel information related to time‐dependent prestress losses after 70 years in service as well as the structural performance of such existing post‐tensioned concrete structures dating from that pioneering period.

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Section: Finite Element Modelingmentioning

confidence: 97%

Assessment of posttensioned concrete beams from the 1940s: Large‐scale load testing, numerical analysis and Bayesian assessment of prestressing losses

Botte

Vereecken

Taerwe

et al. 2021

Structural Concrete

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“…PARC_CL 2.1 can be applied for the prediction of the cyclic and dynamic response of RC structures since it includes the effects of plastic and irreversible deformations in the unloading-reloading phase [20]. The model also allows to correctly catch other aspects which can be very important in the analysis of existing RC structures, such as the buckling of longitudinal reinforcement [21], time-dependent effects and the corrosion of reinforcement [22], which however lie outside of the scope of this work.…”

Section: Modelling Assumptionsmentioning

confidence: 99%

Evaluation of the Seismic Vulnerability of Existing Pre-Code Rc Core Structural Systems Through Non-Linear Pushover Analyses

Belletti¹,

Martinelli²,

Michelini³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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In the last years, a growing attention has been devoted to the seismic vulnerability assessment of existing Reinforced Concrete (RC) framed buildings designed only for gravitational loads. The seismic behavior of existing framed buildings with an inner RC stairwell core has been investigated much less so far, even if this structural typology has known a certain spread from the Seventies onwards, especially in the Italian largest urban areas. In this work, the seismic behavior a relevant and representative example of existing pre-code RC core medium rise building is evaluated by performing nonlinear pushover analyses. The effect of different modelling assumptions regarding the degree of collaboration between frames and RC walls on the structural response is discussed. The influence of masonry infills on the global structural response is also evaluated by running the analyses both on the bare structure and on a structural model considering a distribution of masonry panels not regular in elevation: the latter distribution corresponds to a typical situation for the considered typology.

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“…Corrosion of prestressed reinforced concrete structures leads to a decrease in the size of reinforcement, deterioration of mechanical properties of steel, cracking of surrounding concrete, and decay of bonds at the interface «steel-concrete». Paper [32] proposes a numerical approach that can take into consideration all the effects associated with the corrosion process using a nonlinear analysis of the finite elements (NLFEA) and modeling of membrane or shell elements. The cited work is based on a huge theoretical base and computer simulation; however, it would be good to support it with experimental research.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Development methodology of determinating residual carrying capacity of reinforced concrete beams with damages tensile reinforcement which occurred during loading

Vegera

Vashkevych

Blikharskyy

et al. 2021

EEJET

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This paper reports the improved and verified procedure for calculating reinforced concrete beams affected by damage to stretched reinforcement when loaded. The main results from testing the reinforced concrete beams with damage in the stretched zone in the form of one hole in the reinforcement in the middle of the beam are given. The variable parameter of the study was the level of load resulting in the damage. It acquired values of 0, 30 %, 50 %, 70 % of the bearing capacity of control undamaged samples. Overall, the results of testing 12 samples are given. A new procedure has been proposed for taking into consideration changes in the mechanical characteristics of stretched reinforcement arising from its damage. This makes it possible to more accurately establish the bearing capacity of reinforced concrete bended elements affected by damage to their reinforcement during operation. The analysis of the calculation, compared with experimental quantities, led to a conclusion that the strain model could determine when the bearing capacity of reinforced concrete beams without damage and with damage to working reinforcement is exhausted. Based on the improved algorithm, the principle of using a strain model was proposed to establish when the bearing capacity of damaged samples, taking into consideration the effect of the load level, is exhausted. The theoretical estimation, considering when the bearing capacity is exhausted, showed results that are 3...21 % less than the experimental values, which ensures reliability of calculation of such structures. The proposed calculation provides a new approach to determining the bearing capacity of reinforced concrete beams damaged during operation. That, in turn, makes it possible to more accurately determine the residual bearing capacity of structures and increases the safety of their operation.

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Numerical evaluation of the corrosion effects in prestressed concrete beams without shear reinforcement

Cited by 39 publications

References 30 publications

Assessment of posttensioned concrete beams from the 1940s: Large‐scale load testing, numerical analysis and Bayesian assessment of prestressing losses

Assessment of posttensioned concrete beams from the 1940s: Large‐scale load testing, numerical analysis and Bayesian assessment of prestressing losses

Evaluation of the Seismic Vulnerability of Existing Pre-Code Rc Core Structural Systems Through Non-Linear Pushover Analyses

Development methodology of determinating residual carrying capacity of reinforced concrete beams with damages tensile reinforcement which occurred during loading

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