Assessment and failure test of a prestressed concrete bridge

Bagge, Niklas; Nilimaa, Jonny; Blanksvärd, Thomas; Täljsten, Björn; Elfgren, Lennart; Sundquist, H.; Carolin, Anders

doi:10.1201/9781315375175-147

Cited by 8 publications

(14 citation statements)

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“…However, it is very difficult to obtain its exact value at the time of testing. In addition to the standard analytical evaluation that should be used in all cases, some experimental methods have been verified and applied worldwide [ 17 , 18 , 20 , 21 , 26 , 27 ]. Nevertheless, these methods provide different results compared to the analytically calculated value.…”

Section: Discussionmentioning

confidence: 99%

“…Nevertheless, other new or additional relevant information can also be desirable and useful, especially regarding the unknown value of a prestressing force that is acting on the structure [ 14 , 15 , 16 ]. Likewise, several indirect techniques or structural tests can be used, such as the saw-cut method or structural response method [ 17 , 18 , 19 ]. These methods are based on observation of the structural behavior after the application of a known load.…”

Section: Introductionmentioning

confidence: 99%

“…The method aims to isolate concrete block from acting forces by means of saw-cuts. Residual prestressing force is subsequently calculated from normal stress relief initiated by sawing [ 17 , 18 ]. The ratio of isolation of concrete block is dependent on the parameters of saw-cuts—depth and axial distance [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

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Determination of Prestress Losses in Existing Pre-Tensioned Structures Using Bayesian Approach

Moravčík

Kraľovanec

2022

Materials

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Deterioration of materials and structures is an unavoidable fact, and prestressed concrete structures are not an exception. The evaluation of load-carrying capacity and remaining service life includes collecting various information. However, one type of information is essential and the most important, the state of prestressing, which inevitably decreases over time. Currently, many possible methods for the evaluation of prestressing are available. These techniques are part of the structural assessment and provide residual prestressing force value which is later used in the evaluation process. Therefore, it is suitable to provide the value of prestressing force based on certain probabilistic backgrounds. This study addresses the determination of residual prestressing force in pre-tensioned railway sleepers one year after their production, using the so-called Bayesian approach. This technique is focused on the validation of results obtained from the application of the non-destructive indirect saw-cut method. The Bayesian approach considers analytic calculation as the primary method of prestressing determination. In this paper, Monte Carlo simulation was used to determine the total variability that defines all Bayesian systems of probability functions. Specifically, a total of 1000 simulations was applied, and the current random vector of prestressing force derived from the analytical calculation has been assumed as a normally distributed function. Finally, obtained results for different depths of saw-cuts are compared. The results of the experimental and statistical determination of residual prestressing force provide its value with a 95% confidence level. This study suggests that the implementation of the probability approach can be an effective tool for determining prestress losses.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Determination of Prestress Losses in Existing Pre-Tensioned Structures Using Bayesian Approach

Moravčík

Kraľovanec

2022

Materials

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“…At present, we know various direct and indirect approaches for determining the value of residual prestressing force. Commonly, these methods can be categorized according to their impact on the investigated construction or methodology in which the prestressing force is monitored [ 8 , 9 , 10 , 11 ]. The techniques with no or only a negligible impact on the structure’s integrity are usually considered non-destructive or semi-destructive.…”

Section: Introductionmentioning

confidence: 99%

“…On the contrary, the application of indirect methods, such as the saw-cut method (SCM) and structural response method (SRM), leads to the calculation of the prestressing force indirectly from the measured values. Measured quantities can be represented by, e.g., deflection, stress (or strain) release, the width of the cracks, and so on [ 10 , 11 , 12 ]. Ongoing research in the field of non-destructive prestressing force monitoring is focused, for example, on vibration methods, impedance-based methods, elasto-magnetic methods, acoustic elastic methods, and strain-based methods.…”

Section: Introductionmentioning

confidence: 99%

State of Prestressing Analysis of 62-Year-Old Bridge

2022

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Ageing infrastructure leads to the need for a proper assessment and final decisions considering its state. In the case of prestressed concrete structures, knowledge of the residual state of prestressing is the crucial factor. Therefore, reliable diagnostic techniques for determining the residual value of the prestressing force are needed. This information is subsequently used in the process of the quantification of the load-carrying capacity and remaining service life of prestressed concrete structures. The presented paper introduces an evaluation of a monolithic 62-year-old prestressed concrete bridge, which was built in 1959. The assessment was carried out as a result of concerns after exposure of the anchorage area of the bridge, which was executed during the construction of the new system of anti-flood barriers in the town of Banska Bystrica in central Slovakia. Therefore, the diagnostic survey and subsequent determination of the residual prestressing force included the application of the saw-cut method, the structural response method, and the Barkhausen noise technique. Finally, the experimental program supported by numerical analysis provided information about the actual state of prestressing in the bridge. Results of performed analysis suggested that the state of prestressing of the bridge in question does not significantly differ from the expected level of prestressing after 62 years of service. Subsequently, obtained conclusions enabled the determination of the load-carrying capacity for future use in the form of a pedestrian bridge.

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Demonstration and examination of a procedure for successively improved structural assessment of concrete bridges

Bagge

2019

Structural Concrete

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Assessing the load‐carrying capacity of existing bridges is an important infrastructure management task. In order to support the structural assessment of concrete bridges better, a procedure has been proposed, based on successively improving the bridge analysis. A multilevel strategy for structural analysis has been combined with concepts for verification of the desired safety margin, thus providing tools for engineers to model the structural behavior of bridges more accurately when necessary. This paper describes the procedure as applied to a prestressed concrete girder bridge, with use of experiences from the previous failure tests and associated evaluations of the bridge. Initial structural assessment indicated the critical failure mode to be due to shear in one of the girders; however, the enhanced analysis showed a complex failure involving both the girder and the bridge deck slab. Improving the structural analysis using nonlinear FE analysis for the loading initially identified as critical, increased the permitted axle loads on the bridge to 12 to 14 times those given by traditional and standardized assessment methods, depending on the concept used for safety verification. The model uncertainty was crucial for the verification of the structural safety and has to be properly taken into account. However, there are few recommendations, with regard to model uncertainties, on the application of nonlinear FE analysis, and detailed guidelines should be used for the modeling procedure in order to reduce analyst‐dependent variability in the results. The presented study demonstrates the applicability and the advantages of using the proposed procedure for successively improved analysis for bridge assessment.

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Assessment and failure test of a prestressed concrete bridge

Cited by 8 publications

References 0 publications

Determination of Prestress Losses in Existing Pre-Tensioned Structures Using Bayesian Approach

Determination of Prestress Losses in Existing Pre-Tensioned Structures Using Bayesian Approach

State of Prestressing Analysis of 62-Year-Old Bridge

Demonstration and examination of a procedure for successively improved structural assessment of concrete bridges

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