Innovative precast bridge superstructure using ultra high performance concrete girders

This study investigated the optimum use of ultra high performance concrete (UHPC) for two- and three-lane simply supported bridges. Two designs were investigated: (i) typical cast in place concrete slab on precast/prestressed UHPC girders; and (ii) typical cast in place concrete slab on precast/prestressed UHPC girders. The study measured stress distributions and concentration zones in the girders under dead- and traffic-loads. The concrete quantities and the total areas of prestressing steel were calculated for the UHPC designs and compared to typical concrete designs.Dans le cadre de cette \ue9tude, on a examin\ue9 l'utilisation optimale du b\ue9ton \ue0 tr\ue8s haute performance (BTHP) dans des ponts routiers \ue0 trav\ue9e ind\ue9pendante \ue0 deux (2) et \ue0 trois (3) voies de circulation. Deux (2) conceptions diff\ue9rentes ont \ue9t\ue9 \ue9tudi\ue9es : i) dalle de b\ue9ton coul\ue9e en place, type, sur poutres en BTHP pr\ue9fabriqu\ue9/pr\ue9contraint; et ii) dalles de b\ue9ton coul\ue9es en place, types, sur poutres en BTHP pr\ue9fabriqu\ue9/pr\ue9contraint. On a examin\ue9 les distributions des contraintes et les zones de concentration dans les poutres en charges permanentes et en surcharges impos\ue9es par le roulage. Les quantit\ue9s de b\ue9ton ainsi que les aires totales d'acier de pr\ue9contrainte ont \ue9t\ue9 calcul\ue9es pour les conceptions \ue0 base de BTHP et compar\ue9es aux conceptions de b\ue9ton types.Peer reviewed: YesNRC publication: Ye