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Querkrafttragfähigkeit von Stahlbetonplatten ohne Querkraftbewehrung unter konzentrierten Einzellasten - Teil 1: Versuche
Other Titles
Shear capacity of reinforced concrete slabs under concentrated loads – Part 1: experimental investigations
Publikationstyp
Journal Article
Date Issued
2017-09-06
Sprache
German
Author(s)
Institut
TORE-URI
Journal
Volume
112
Issue
9
Start Page
568
End Page
578
Citation
Beton- und Stahlbetonbau 9 (112): 568-578 (2017-09)
Publisher DOI
Scopus ID
Publisher
Ernst
Shear capacity of reinforced concrete slabs under concentrated loads – Part 1: experimental investigations. A large number of the deck slabs of existing concrete bridges in Europe show, according to current design rules, a deficit in shear capacity. Strengthening is in most cases difficult and very expensive. The authors are not aware of any real structural failure of bridge decks caused by a lack shear capacity, when the structure was designed properly. This is an indication that the existing design approaches have unknown reserves and the transverse load bearing capacity of reinforced concrete slabs is not sufficiently understood and clarified. Extensive international research activities on this subject confirm this fact. Up to now, there is no consensus regarding the design method (shear or punching), the relevant section, and the reduction of the shear force caused by block loads close to supports (β-factor). Fourteen large tests were carried out on cantilevered concrete slabs (3.25 × 4.5 m, thickness 0.25 m) without transverse reinforcement, as well as extensive numerical simulations. The design shear capacity of bridge decks is decisively determined by the concentrated wheel loads of heavy traffic. Thus, the test specimens were loaded by concentrated block loads on an area of 40 × 40 cm according to the load model 1 of the Eurocode 1 [1] up to failure. The influence of the load position, the mutual interference between adjacent block loads, as well as the influence of different reinforcement ratios on the shear capacity were investigated. The test results show that conventional deck slabs of concrete bridges have considerably greater load bearing capacities than according to EC2[2].
DDC Class
690: Hausbau, Bauhandwerk