Slender sunshades beams made of UHPFRC between two tunnels in Marseille

Author(s) : A. Simon, B. Dimanche, J. Resplendino
Paper category : Proceedings
Book title : UHPFRC 2017 Designing and Building with UHPFRC: New large-scale implementations, recent technical advances, experience and standards
Editor(s) : F. Toutlemonde & J. Resplendino
Print-ISBN : 978-2-35158-166-7
e-ISBN : 978-2-35158-167-4
Publisher : RILEM Publications SARL
Publication year : 2017
Pages: 857 - 866
Total Pages : 10
Language : English

Abstract: The project was to implement beam elements above an area between two tunnels in Marseille, with two objectives: to protect drivers from the sunlight at tunnel exit and to protect residents from noise due to the traffic. Very slender UHPFRC prestressed beams, 14.50m long, with an omega-shaped inclined cross section and a 5cm thick web, were built. To meet the fire resistance requirement, a specific BSI® formula was used, mixing two types of fibres: steel fibres for the concrete mechanical properties and polypropylene fibres to ensure stability in case of fire. Laboratory tests coupled with numerical simulations were performed to confirm the design. To achieve the noise reduction performance required, an insulating material has been placed into the omega cross section. The adopted solution efficiency has been validated by measurements on site. Before starting the production of the 90 elements, a prototype was made. It allowed to validate all steps for beams precasting, and to justify the K coefficients of fibres orientation, according to French AFGC recommendations.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00

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