Time-dependent reliability assessment of existing concrete bridges with varying knowledge levels by proof load testing

de Vries, Rein; Lantsoght, Eva O. L.; Steenbergen, Raphaël D. J. M.; Fennis, Sonja A. A. M.

doi:10.1080/15732479.2023.2280712

Cited by 2 publications

(1 citation statement)

References 37 publications

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“…The specificity of each bridge in service leads to inadequacies in the direct assessment of the structure based on the available theoretical analysis results. According to Vries, the limitations of the application of reliability theory were mainly reflected in the fact that most of the research focused on the influence of individual factors, and the research results were scattered and had not formed a comprehensive system [18]. Results obtained by theoretical calculations differ significantly from measured values.…”

Section: Introductionmentioning

confidence: 99%

Improved Evidence Fusion Theory for the Safety Assessment of Prestressed Concrete Bridges

Shu,

Ma,

Ding

et al. 2024

Buildings

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The safety condition assessment of prestressed concrete bridges is currently subject to great uncertainty due to the subjectivity of data collection and data types. This study proposes an improved evidence fusion method, improving the conventional Dempster–Shafer fusion method to reduce assessment inaccuracies caused by data uncertainty. Firstly, the uncertain analytic hierarchy process was applied to construct a three-level safety assessment model for 15 different indicators with their initial weights. Secondly, the fuzzy matter element theory was proposed to obtain basic probability assignments required for the evidence fusion. Finally, an improved evidence fusion method was proposed based on the evidence credibility and preprocessing corrections for highly conflicting evidence. In this study, a prestressed concrete bridge in eastern China was used as a case study to perform a comprehensive safety assessment and verify the effectiveness and practicality of the proposed method. The assessment results demonstrate that the improved fusion method in this study can deal with conflicting evidence better than existing fusion methods. Compared with conventional fuzzy AHP method, it has greater sensitivity to certain indicators with severe damages, which prevents those indicators from being overshadowed by other well-performing ones in the overall assessment.

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Section: Introductionmentioning

confidence: 99%

Improved Evidence Fusion Theory for the Safety Assessment of Prestressed Concrete Bridges

Shu,

Ma,

Ding

et al. 2024

Buildings

View full text Add to dashboard Cite

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Saw‐cut method verification for determining the most important factors influencing its applicability

Kralovanec,

Moravcik,

Zahuranec

et al. 2024

Structural Concrete

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The current situation with prestressed structures raises questions about the ways how to determine residual prestressing which is the crucial factor for the evaluation of the prestressed structure. Therefore, this study aims to enhance existing knowledge of the so‐called Saw‐cut method which is considered a non‐destructive indirect technique. The presented study focuses on the determination of various factors which could influence the applicability and accuracy of this method such as both compressive and tensile normal stress release, the type of measuring instrument (linear foil strain gauge or newly developed FBG sensor), and the length of the normal stress release recording (up to almost 9 h). The obtained results suggest that tensile normal stress release could be more problematic for the evaluation than compressive normal stress release. Moreover, the application of FBG sensors seems to be more precise but also more complicated regarding the installation, recording and costs. Finally, the time span of the measurement can influence the residual normal stress release. For practical reasons, 60 min after the performance of the final sawing should be sufficient. Finally, when used at locations with adequate compressive normal stress, the Saw‐cut method seems to be a promising tool for prestressing evaluation.

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Time-dependent reliability assessment of existing concrete bridges with varying knowledge levels by proof load testing

Cited by 2 publications

References 37 publications

Improved Evidence Fusion Theory for the Safety Assessment of Prestressed Concrete Bridges

Improved Evidence Fusion Theory for the Safety Assessment of Prestressed Concrete Bridges

Saw‐cut method verification for determining the most important factors influencing its applicability

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