| Summary: | An alternative structural system for short span bridges is presented: a precast segmental double-T with external, unbonded post-tensioning tendons. Single-span designs from 20 to 45 m long show that the system can be implemented over a wide range of spans and that the system’s sensitivity to post-tensioning losses reported in previous literature can be reduced by aligning the prestressing force more concentrically.
Designs for multi-span bridges using this system are presented using simply supported spans connected by thin flexible linking slabs made of ultra high-performance fibre-reinforced concrete and using sections made fully continuous over intermediate supports.
A simplified method of geometry control is presented to facilitate the proper alignment of precast segments without the use of match casting.
The precast segmental double-T bridge is compared to sixteen existing slab on girder bridges and found to be a competitive alternative in terms of material use, cost, construction schedule, and aesthetic merit.
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