Partial factor methods for existing structures according to <i>fib</i> Bulletin 80: Assessment of an existing prestressed concrete bridge

Gino, Diego; Castaldo, Paolo; Bertagnoli, Gabriele; Giordano, Luca; Mancini, Giuseppe

doi:10.1002/suco.201900231

Cited by 41 publications

(28 citation statements)

References 12 publications

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“…However, the bridge considered in Ref. 77 does not present any visible signs of deterioration due to corrosion. As such, investigation is still required whether the applied method is also valid for prestressed/posttensioned bridges subjected to corrosion.…”

Section: Assessment Of Prestressed Structuresmentioning

confidence: 98%

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Assessment of corroded prestressed and posttensioned concrete structures: A review

Vereecken

Botte

Lombaert

et al. 2021

Structural Concrete

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Prestressed structures are commonly used all over the world. They might be subjected to degradation, such as corrosion of the prestressing steel. This can influence the resistance of these structures and induce early failure. Hence, prediction of the corrosion level is important in the assessment of existing prestressed structures. For this purpose, the corrosion process and the accompanying influences on the structure should be modeled. For reinforced concrete (RC) structures, a lot of research and guidelines are available to model the corrosion process. Nevertheless, this corrosion process might differ for prestressed structures, due to the different structural composition, the different geometry of the strands or tendons compared with reinforcement bars, the presence of the prestress, and so on. Moreover, for posttensioned structures, initiation and propagation of corrosion are even more different from corrosion in RC structures, due to the location of the steel in ducts and the lack of direct contact with the surrounding concrete. In this paper, a state‐of‐the‐art on the assessment of prestressed and posttensioned structures subjected to corrosion is given based on a literature review. Different models for the corrosion process and their influence on the structure are discussed. Comparison is made between reinforced, prestressed, and posttensioned structures. Furthermore, some assessment procedures are indicated and relevant topics for further research are given.

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Section: Assessment Of Prestressed Structuresmentioning

confidence: 98%

“…A more simplified assessment method consists of the application of the partial factor method for existing structures according to fib Bulletin 80, as in Ref. 77 applied for the assessment of an existing PC bridge. However, the bridge considered in Ref.…”

Section: Assessment Of Prestressed Structuresmentioning

confidence: 99%

Assessment of corroded prestressed and posttensioned concrete structures: A review

Vereecken

Botte

Lombaert

et al. 2021

Structural Concrete

View full text Add to dashboard Cite

show abstract

“…If assessment is based on the current Eurocodes, this often leads to shear criteria that do not suffice and (expensive) strengthening of the structures would be required. A first possible solution lies in the use of adjusted partial factors as suggested by Caspeele et al 2 and applied by Gino et al 3 . Another solution is the application of more refined models such as the use of finite element models of the structure 4 .…”

Section: Introductionmentioning

confidence: 99%

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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“…In this work, a numerical example supplements general procedures and illustrates how the design values and partial factors can be derived for different target reliability levels and remaining working lives. The application of the DVM and the APFM to the assessment of an existing prestressed concrete bridge is illustrated in [14,15].…”

Section: Introductionmentioning

confidence: 99%

Reliability Verification of Existing RC Structures Using Partial Factors Approaches and Site-Specific Data

et al. 2021

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The assessment of an existing structure to determine its suitability for present and future use entails different sorts of problems than encountered when designing new structures. The differences revolve essentially around the nature of the information available. In existing structures, deteriorated or otherwise, the accuracy of the models used for such assessments can usually be improved by acquiring more data. The most accurate way to find actual load and resistance would be to conduct a probabilistic analysis using site data. This is a time-consuming process, however, calling for a working knowledge of probabilistic methods that may not be suited to everyday use by practising engineers. For this reason, in the past few years various studies have been conducted to develop assessment approaches, compatible with Eurocodes, which include the same verification format as normally applied for designing new structures. In this paper, the application of several of these approaches is illustrated by means of the reliability verification of one of the main beams of the reinforced concrete structure of an industrial building from the 1940s, recently transformed into a cultural centre. The obtained results are discussed and compared to the findings of a full probabilistic analysis.

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Partial factor methods for existing structures according to fib Bulletin 80: Assessment of an existing prestressed concrete bridge

Cited by 41 publications

References 12 publications

Assessment of corroded prestressed and posttensioned concrete structures: A review

Assessment of corroded prestressed and posttensioned concrete structures: A review

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

Reliability Verification of Existing RC Structures Using Partial Factors Approaches and Site-Specific Data

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