Title: UHPFRC Precast slabs and field-cast joints of the Isabey- Darnley pedestrian bridge
Author(s): Charron, J.P.; Desmettre, C.; Cantin Bellemare, E.
Publication: Symposium Paper
Appears on pages(s): 494-503
Keywords: Ultra-High Performance Fiber Reinforced Concrete (UHPFRC); precast slabs; field-cast joints; pedestrian bridge; bending behavior.
A cast-in-place reinforced concrete footbridge built in 1967 suffering from extensive
concrete spalling and rebar corrosion needed to be replaced. The use of a steel Pony-Warren
truss combined with thin precast UHPFRC slabs linked by short UHPFRC field-cast joints
was selected to build an innovative, durable and aesthetic footbridge minimizing impact on
traffic during construction. Material rationalization allowed respective reductions of 64 % and
91 % of concrete and rebar volumes in the slab in comparison to a conventional reinforced
concrete slab. The design process was completed with non-linear finite element calculations
to obtain an adequate behaviour of the UHPFRC slabs and joints at service and ultimate limit
states. A full-size proof specimen was then tested under positive bending moment and
confirmed being adequate and fulfilling all the design specifications. Construction of the
precast slab was successful and required less time than a conventional slab. The long-term
performance provided by the UHPFRC slab will be followed up in the next decades.