Prestressed Concrete Bridges in Germany – Overview of Current New Structures, Re-analysis and Research Activities to Preserve the Existing Infrastructure Network

Fischer, Oliver

doi:10.1016/j.proeng.2016.08.274

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…However, in numerous cases, the resistance under shear and torsion, as well as fatigue loads, cannot be verified [36][37][38], although the webs of these prestressed bridges do not reveal any shear cracks. A further refinement of the shear assessment under static and fatigue loading can reduce the need for strengthening measures or restrictions of usage significantly and will extend the service life of existing bridge structures.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Testing of Shear Reinforcement in Prestressed Concrete T-Beams of Bridges

Hegger

2020

Applied Sciences

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In the recent years, bridges, as an important part of the national and international infrastructure, had to comply with stricter requirements due to increased heavy load traffic. Many of these bridge structures built in the 1960s and 1970s often contain less web reinforcement than the modern required minimum web reinforcement. In this context, the shear resistance under cyclic loading is of special interest. For this reason, experimental tests were conducted on prestressed concrete beams with and without shear reinforcement at the Institute of Structural Concrete of RWTH Aachen University to investigate the shear fatigue strength. This paper describes the recent tests on ten Tshaped prestressed beams with web reinforcement. The specimens were able to resist more load cycles than predicted by the approaches implemented in the Eurocodes for bridges. Based on the test results, design models for shear under cyclic loading should be reviewed and improved, especially regarding the assessment of existing structures.

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Section: Introductionmentioning

confidence: 99%

Fatigue Testing of Shear Reinforcement in Prestressed Concrete T-Beams of Bridges

Hegger

2020

Applied Sciences

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“…24 The stepwise verification procedure accounts for the characteristics of older bridges and enables a more refined determination of the structural capacity. However, in numerous cases, the resistance under shear and torsion as well as fatigue loads cannot be verified, [25][26][27] although the webs of these prestressed bridges do not reveal any shear cracks. A further refinement of the shear assessment under static and fatigue loading can reduce the need for strengthening measures or restrictions of usage significantly and will extend the service life of existing bridge structures.…”

Section: Introductionmentioning

confidence: 99%

Shear fatigue of prestressed I‐beams with shear reinforcement

Teworte¹,

Hegger

2020

Structural Concrete

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In the last decades, increasing traffic loads have led to higher requirements on the bearing capacity of existing and also new bridges. In particular, many bridge structures built in the 1960s and 1970s often contain less web reinforcement than the nowadays required minimum web reinforcement. In this context, the shear resistance under cyclic loading is of special interest. For this reason, experimental tests were conducted on prestressed concrete beams with and without shear reinforcement at the Institute of Structural Concrete of RWTH Aachen University within the last years to investigate the shear fatigue strength. The specimens were able to resist more load cycles than predicted by the approaches implemented in the Eurocodes for bridges. Based on the test results, design models for shear under cyclic loading should be reviewed and improved, especially with regard to the assessment of existing structures. This paper describes the recent tests on 20 I-shaped prestressed beams with web reinforcement.

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“…Ahlborn et al [8] noted that bridge structures in the USA are 43 years old on average. According to Fischer [9], the average age of German bridges is about 45 years and over 65% of the structures are over the age of 30 years. Slovak bridges are about the same age on average as German bridges [10].…”

Section: Introductionmentioning

confidence: 99%

System identification of a composite beam

Sokol

Venglár

2017

Pollack Periodica

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The primary aim of the paper is to present a simple method for determining the changes in stiffness of a composite beam. The experimental model was made from wood and plaster boards. It was simply supported beam with a length of 4 m. Accelerations were measured at 24 points along the beam. In either case data for intact and damaged models were acquired. The identification of the damage was done using a code developed by the authors. The vertical modeshapes were analyzed, so changes in the stiffness could be detected.

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Prestressed Concrete Bridges in Germany – Overview of Current New Structures, Re-analysis and Research Activities to Preserve the Existing Infrastructure Network

Cited by 4 publications

References 4 publications

Fatigue Testing of Shear Reinforcement in Prestressed Concrete T-Beams of Bridges

Fatigue Testing of Shear Reinforcement in Prestressed Concrete T-Beams of Bridges

Shear fatigue of prestressed I‐beams with shear reinforcement

System identification of a composite beam

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