Bewertung von Bestandsbauwerken mit gemessenen Daten, Teil 2

Küttenbaum, Stefan; Maack, Stefan; Braml, Thomas; Taffe, Alexander; Strübing, Thorsten

doi:10.1002/best.202000087

Cited by 8 publications

(4 citation statements)

References 14 publications

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“…With focus on the investigation of the structure, practical examples for the use of data in the reassessment process were published in [2,29,30]. Structural inspection processes are, e.g., the localization of rebars and tendons, the determination of the cross-sectional thickness, the estimation of concrete strengths, the detection of corrosion or the investigation of the injection status and of the applied forces to the tendons.…”

Section: Use Of Full-probabilistic Methods For the Analysis Of The Ba...mentioning

confidence: 99%

“…Figure 11 displays the results of a sensitivity analysis of the load bearing capacity for shear and bending moment of an existing bridge based on measured data. The numbers in brackets display the change compared to the results of the sensitivity analysis without the implementation of the measurement data, see [30]. As seen on the left side, the sensitivity of the distance of shear reinforcement changes significantly with the implementation of the on-site results.…”

Section: Use Of Full-probabilistic Methods For the Analysis Of The Ba...mentioning

confidence: 99%

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Practical concepts for the use of probabilistic methods in the structural analysis and reassessment of existing bridges - presentation of latest research and implementation

Braml

Kainz

2022

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In structural engineering and bridge construction, probabilistic calculations are only performed in a few exceptional cases. The ability to directly use information from the existing structure is an important advantage of probabilistic methods. Geometric data or the position and quantity of the installed reinforcing steel and tendons can be measured. Results from monitoring of the traffic can be used to generate structure-specific load models. Many clients are still very sceptical about the results of probabilistic calculations, even though there are several examples of successful application. The use of probabilistic verification formats is explicitly permitted by the German guideline for the assessment of existing bridges (German: Nachrechnungsrichtlinie). Since a high degree of special knowledge is required for the application of probabilistic calculations, it is difficult to establish the potential of this verification method in practice. It is necessary to enable the practical engineer to utilize the advantages of probabilistic calculations and to include the actual structural conditions into the calculation model, but without the need for all the special knowledge. Structure-specific partial safety factors include measured data and can be used for the well-known and in the codes established semi-probabilistic design concept. The authors present examples for the successful application of probabilistic methods and of data measurement during the reassessment of two existing bridges in Germany. The capabilities of full-probabilistic calculations for the reassessment of existing structures are described and concepts for the calculation of structure-specific partial safety factors are shown.

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Section: Use Of Full-probabilistic Methods For the Analysis Of The Ba...mentioning

confidence: 99%

Section: Use Of Full-probabilistic Methods For the Analysis Of The Ba...mentioning

confidence: 99%

Practical concepts for the use of probabilistic methods in the structural analysis and reassessment of existing bridges - presentation of latest research and implementation

Braml

Kainz

2022

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“…The limit state functions are formulated to include as many measurable data as possible. While a number of limit state functions for current design equations are available in literature [10][11][12], the former design equations of the codes from the time of construction and from previous codes still need to be formulated as limit state equations for fullprobabilistic calculations. The loads and reactions from the finite element models are converted from characteristic values to mean values and a fully probabilistic calculation is performed based on the transformed results from the finite element models and with accepted distribution parameters from literature, e.g., provided by the Joint Committee on Structural Safety.…”

Section: Limit States and Calculation Principlesmentioning

confidence: 99%

Guideline on NDT‐supported reliability assessment of existing structures ‐ Current developments in Germany

Küttenbaum,

Braml,

Heinze

et al. 2023

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Information about an existing structure can be collected at certain costs to evaluate the reliability and condition as realistically as necessary. This information can be relevant or irrelevant, true or biased, precise or imprecise. The incorporation of relevant and quality‐assessed measured information into reliability reassessment offers the chance to extend remaining lifetimes and support decision making about optimal actions or maintenance strategies. This paper shows recent developments in a national research project that aims to produce a guideline on the NDT‐based, structure‐specific modification of partial safety factors. The general methodology, results from recalculations according to the Eurocodes and metrologically solvable testing tasks relevant in the recalculation of the concrete bridges are shown and compared with the non‐destructive testing methods applicable to concrete bridges. A case study is used to demonstrate that as‐built drawings, in this case of the positions of tendons and shear reinforcement, can be verified using the radar method.

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“…Further information about the case-study outlined above can be found in [11]. A second study dealing with ultimate limit states was published in [18,19].…”

Section: Demonstration -Measurement Uncertainty In Structural Reliabi...mentioning

confidence: 99%

On the treatment of measurement uncertainty in stochastic modeling of basic variables

Küttenbaum

Maack²,

Taffe³

et al. 2022

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The acquisition and appropriate processing of relevant information about the considered system remains a major challenge in assessment of existing structures. Both the values and the validity of computed results such as failure probabilities essentially depend on the quantity and quality of the incorporated knowledge. One source of information are onsite measurements of structural or material characteristics to be modeled as basic variables in reliability assessment. The explicit use of (quantitative) measurement results in assessment requires the quantification of the quality of the measured information, i.e., the uncertainty associated with the information acquisition and processing. This uncertainty can be referred to as measurement uncertainty. Another crucial aspect is to ensure the comparability of the measurement results.This contribution attempts to outline the necessity and the advantages of measurement uncertainty calculations in modeling of measurement data-based random variables to be included in reliability assessment. It is shown, how measured data representing time-invariant characteristics, in this case non-destructively measured inner geometrical dimensions, can be transferred into measurement results that are both comparable and quality-evaluated. The calculations are based on the rules provided in the guide to the expression of uncertainty in measurement (GUM). The GUM-framework is internationally accepted in metrology and can serve as starting point for the appropriate processing of measured data to be used in assessment. In conclusion, the effects of incorporating the non-destructively measured data into reliability analysis are presented using a prestressed concrete bridge as case-study.

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Bewertung von Bestandsbauwerken mit gemessenen Daten, Teil 2

Cited by 8 publications

References 14 publications

Practical concepts for the use of probabilistic methods in the structural analysis and reassessment of existing bridges - presentation of latest research and implementation

Practical concepts for the use of probabilistic methods in the structural analysis and reassessment of existing bridges - presentation of latest research and implementation

Guideline on NDT‐supported reliability assessment of existing structures ‐ Current developments in Germany

On the treatment of measurement uncertainty in stochastic modeling of basic variables

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