United States Department of Transportation
i
Bridge-in-a-Backpack™ task 6 : guidelines for long term inspection and maintenance.
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2016-01-01
[PDF-942.40 KB]
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Abstract:This report includes fulfillment of Task 6 of a multi-task contract to further enhance concrete filled FRP tubes, or
the Bridge in a Backpack. Task 6 provides guidelines for long term inspection and maintenance.
This bridge consists of a buried arch system including structurally integrated stay-in-place concrete-filled fiber
reinforced-polymer (FRP) tubes (CFFTs) as main structural members, an FRP or concrete deck,
foundations, and headwalls holding back soil. The FRP composite tube, typically constructed of braided carbonglass
material within a vinylester resin (VE-based GFRP), provides a stay-in-place form for the concrete and tensile
reinforcement as a structurally integrated part of the arch composite section. As such, the durability and structural
performance of the FRP composite tube and its bond with the concrete throughout the design life are critical to the
overall system durability. The FRP tube is exposed to both the environment on the exterior, and the concrete on the
interior, and these dual exposure durability requirements must be taken into account during design, and carefully
monitored through inspection during service life to detect damage or degradation that could impact strength
or serviceability.
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