Fatigue behaviour of an orthotropic steel bridge deck: Benefits of an Ultra-High Performance Fibre Reinforced Concrete topping layer

GOMES ; MARCHAND ; RENAUD ; MASSOTTE ; ESTIVIN ; BILLO ; BAZIN ; LAPEYRERE ; LAUVIN ; BARIN ; SIEGERT ; TOUTLEMONDE

Type de document
COMMUNICATION AVEC ACTES INTERNATIONAL (ACTI)
Langue
anglais
Auteur
GOMES ; MARCHAND ; RENAUD ; MASSOTTE ; ESTIVIN ; BILLO ; BAZIN ; LAPEYRERE ; LAUVIN ; BARIN ; SIEGERT ; TOUTLEMONDE
Résumé / Abstract
A large-scale experimental program has been carried out at the LCPC structures laboratory to assess the influence of topping layer on the behaviour of orthotropic decks and their resistance to fatigue phenomenon. These tests have been carried out within the frame of a joint R& D project called Orthoplus, in partnership with Eiffage Company, Arcadis engineering office and the Sétra (French Highways technical authority). This project aims at improving the design rules for orthotropic deck and developing a UHPFRC-based innovative solution to improve the durability of orthotropic deck. Loads have been applied to four specimens, 4 m-long and 2.40 m-wide, consisting in a realistic steel orthotropic deck with different types of topping layers: traditional bituminous concrete, thin layer of UHPFRC, or no topping layer. The dimensions of the specimens have been chosen to limit the effect of boundary conditions on the effect of a local loading. The load application has been chosen as representative of real situations and of idealised cases considered in design codes: real truck wheels have been used as well as rectangular steel plates with dimensions complying with Eurocode 1 part 2. The investigation has been focused on the stress obtained at the weld between stiffener and deck plate, at mid-span between transverse crossbeams, which is critical to estimate the fatigue lifespan of real orthotropic deck structures under the effect of repeated local loads induced by traffic. The stress repartition in the different configurations has been assessed through static tests, then 2 million cycles have been applied to verify the fatigue resistance the specimen. The paper details the test protocol and the main results of the experimental program. Namely, the benefits of an increased rigidity provided by the UHPFRC top layer is quantified, due to the reduction in stress concentration at the critical fatigue detail.

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