Failure tests on concrete bridges: Have we learnt the lessons?

Bagge, Niklas; Popescu, Cosmin; Elfgren, Lennart

doi:10.1080/15732479.2017.1350985

Cited by 29 publications

(31 citation statements)

References 33 publications

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“…To influence the probability of failure, the target proof load should be large enough. The only type of test that can answer questions with regard to the ultimate capacity of a structure is a failure test (Elmont 1913, Rösli 1963, Jorgenson and Larson 1976, Cullington et al 1996, Haritos et al 2000, Steinberg et al 2011, Bagge et al 2017b. Such testing is normally done on existing bridges that are functionally obsolete and serve to calibrate theoretical approaches as well as provide an indication regarding the actual response of a real-life structure.…”

Section: Proof Load Testsmentioning

confidence: 99%

General Considerations

Lantsoght¹,

Schmidt²

2019

Load Testing of Bridges

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This chapter discusses aspects that should be considered prior to every load test. The first question that needs to be answered is: "Is this bridge suitable for load testing? If so, what are the goals of the load test?" To answer these questions, information must be gathered, and preliminary calculations should be carried out. In order to evaluate if a bridge is suitable for load testing, different types of testing are shown, the topic of when to load test a bridge is discussed, and structure type considerations are debated. Finally, some safety precautions that should be fulfilled during a load test are discussed.

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Section: Proof Load Testsmentioning

confidence: 99%

General Considerations

Lantsoght¹,

Schmidt²

2019

Load Testing of Bridges

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“…However, the destructive tests of full-scale structures are expensive and difficult to carry out. A few experimental studies are being carried out by scholars in different countries [6,7].…”

Section: Introductionmentioning

confidence: 99%

Flexural Capacity and Behavior of RC Hollow Bridge Beams after a Time Service of 24 Years

Zhou

Lv³

et al. 2020

Advances in Civil Engineering

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The residual bearing capacity of existing bridges has been a controversial topic for engineers and technicians. In order to accurately evaluate the actual bearing capacity of a 24-year-old RC hollow beam bridge, its components with different thickness concrete leveling layer were removed and transported back to the laboratory. The representative static and dynamic responses of the two beams were monitored during the whole procedure. A quick assessment of loading capacity of bridge using crack height and a parameter correction method for the crack width prediction formula in the code were proposed. In addition, comparison of measured and current design codes GB 50010 and ACI 318 predicted behaviour of existing beams was also presented. The results showed that the bending process of the RC hollow beam went through the elastic phase to the elastic-plastic phase and to the final failure. The actual flexural capacity of two beams was 10% larger than the calculated values. The natural vibration frequencies of the beam changed slightly before plastic stage, but the modal amplitude increased with the increase of degree of damage, once the beam entered plastic stage. The predicted deflections according to GB50010 were consistent with the experimental values at about 200 kN; for the code ACI, as the loading force increased, the difference between the two gradually decreased.

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“…Since the few available in‐situ tests (eg, References ) concentrated either on precast beams, single‐span bridges, experiments in the middle of the respective spans or the outer spans of continuous beams, there is a lack of experimental results gained from loading tests on continuous prestressed concrete bridges performed close to inner piers (cf. Reference ). The combination of maximum shear and negative bending moments in this area has also often not been considered in laboratory tests where simply‐supported beams and single loads have been used in general.…”

Section: Introductionmentioning

confidence: 99%

Full‐scale shear capacity testing of an existing prestressed concrete bridge

Gehrlein

Fischer

2019

Civil Engineering Design

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Due to the relatively high average age of the existing bridges, a dramatic increase both in traffic volume and axle loads and because of modified design standards, a realistic prediction of the shear capacity of existing prestressed concrete bridges with little shear reinforcement has become an important topic in German research. In 2017, the Chair of Concrete and Masonry Structures of the Technical University of Munich (TUM), supported by the Federal Ministry of Transport and Digital Infrastructure, was given the unique opportunity to conduct full‐scale field tests at the Hammelburg Bridge built in 1955. According to systematic strength evaluations, many concrete bridges in Germany, especially those which were built prior to 1966, show severe (theoretical) deficits regarding longitudinal shear capacity. The results of the strength evaluation can often not be verified in the real bridges though. The primary objective of the field test therefore was to determine the actual shear capacity of existing prestressed bridges aiming at closing the gap between structural analyses and experience in regard to older concrete bridges. The article at hand presents the conceptual approach, the test set‐up and the execution of the in‐situ testing, the used measuring equipment and essential findings gained from the conducted full‐scale experiments. Furthermore, the results are discussed and the measured maximum loads of all five tests are compared to the results of different theoretical approaches and engineering models, respectively.

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Failure tests on concrete bridges: Have we learnt the lessons?

Cited by 29 publications

References 33 publications

General Considerations

General Considerations

Flexural Capacity and Behavior of RC Hollow Bridge Beams after a Time Service of 24 Years

Full‐scale shear capacity testing of an existing prestressed concrete bridge

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