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Slab-on-Girder Wood-Concrete Composite Highway Bridge

Andrew Lehan has completed his Master of Applied Science thesis on the development of a Slab-on-Girder Wood-Concrete Composite Highway Bridge, with the university of Toronto’s Department of Civil Engineering.

Moses Structural Engineers, FPInnovations, and NSERC, provided financial support in completing this thesis through an NSERC Industrial Post-Graduate scholarship, with Moses Structural Engineers and FPInnovations being industrial co-sponsors. Andrew worked for 6 months in our office during his time working on his thesis in 2010. We’d all like to offer our congratulations to Andrew for the completion of his research on this topic. Click “read more” to view the abstract for Andrew’s thesis.

“This thesis examines the development of a superstructure for a slab-on-girder wood-concrete composite highway bridge. Wood-concrete composite bridges have existed since the 1930’s. Historically they have been limited to spans of less than 10 m. Renewed research interest over the past two decades has shown great potential for longer span capabilities. Through composite action and suitable detailing, improvements in strength, stiffness, and durability can be achieved versus conventional wood bridges. The bridge makes use of a slender ultra-high performance fibre-reinforced concrete (UHPFRC) deck made partially-composite in longitudinal bending with glued-laminated wood girders. Longitudinal external unbonded post-tensioning is utilized to increase span capabilities. Prefabrication using double-T modules minimizes the need for cast-in-place concrete on-site. Durability is realized through the highly impermeable deck slab that protects the girders from moisture. Results show that the system can span up to 30 m while achieving span-to-depth ratios equivalent or better than competing slab-on-girder bridges.”