TITLE

Innovative design approach of precast-prestressed girder bridges using ultra high performance concrete

AUTHOR(S)
Almansour, H.; Lounis, Z.
PUB. DATE
April 2010
SOURCE
Canadian Journal of Civil Engineering;Apr2010, Vol. 37 Issue 4, p511
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The construction of new bridges and the maintenance and renewal of aging highway bridge network using ultra high performance concrete can lead to the construction of long life bridges that will require minimum maintenance resulting in low life cycle costs. Ultra high performance concrete (UHPC) is a newly developed concrete material that provides very high strength and very low permeability to aggressive agents such as chlorides from de-icing salts or seawater. Ultra high performance concrete could enable major improvements over conventional high performance concrete (HPC) bridges in terms of structural efficiency, durability, and cost-effectiveness over the long term. A simplified design approach of concrete slab on UHPC girders bridge using the Canadian Highway Bridge Design code and the current recommendations for UHPC design is proposed. An illustrative example demonstrates that the use of UHPC in precast-prestressed concrete girders yields a more efficient design of the superstructure where considerable reduction in the number of girders and girder size when compared to conventional HPC girders bridge with the same span length. Hence, UHPC results in a significant reduction in concrete volume and then weight of the superstructure, which in turn leads to significant reduction in the dead load on the substructure, especially for the case of aging bridges, thus improving their performance. La construction de nouveaux ponts ainsi que l’entretien et la réfection du réseau vieillissant des ponts autoroutiers par l’utilisation de béton à très haute performance, peut conduire à la construction de ponts à longue durée de vie qui demanderont un minimum d’entretien, permettant ainsi de faibles coûts du cycle de vie. Le béton à ultra haute performance (BUHP) est un nouveau béton qui fournit une très grande résistance et une très faible perméabilité aux agents chimiques tels que les chlorures provenant des sels de déglaçage et de l’eau de mer. Le BUHP pourrait permettre de grandes améliorations par rapport aux ponts conventionnels en béton haute performance en termes d’efficacité structurale, de durabilité et de rentabilité à long terme. L’article propose une approche simplifiée de conception des dalles de béton sur les ponts à poutres en UHPC en utilisant le Code canadien sur le calcul des ponts routiers et les recommandations courantes sur la conception des ouvrages en BUHP. Selon un exemple présenté, l’utilisation des BUHP dans les ponts en poutres de béton précontraint permet une conception plus efficace de la superstructure, permettant une réduction importante du nombre et de la taille des poutres par rapport aux ponts à poutres conventionnels en béton haute performance de la même portée. Ainsi, les résultats de l’utilisation des BUHP engendrent une réduction importante du volume de béton et, ainsi, du poids de la superstructure. Ceci résulte en une réduction importante de la charge permanente sur l’infrastructure, particulièrement dans le cas des ponts vieillissants, améliorant ainsi leur performance.
ACCESSION #
50356657

 

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