Journal
MATERIALS
Volume 15, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/ma15093014
Keywords
FRP composites; shear connectors; fatigue testing; composite beams
Categories
Funding
- US Army Engineering Research and Development Center in Vicksburg, Mississippi, USA [CEED-17-0018]
- University of Maine Transportation Infrastructure Durability Center (TIDC) from the US Department of Transportation's University Transportation Centers Program [69A3551847101]
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This paper describes the development and assessment of a friction-type connector for bridge applications, which relies on a deformed FRP surface to transfer shear force. The connector exhibits high strength and stiffness.
This paper details the development and experimental assessment of a friction-type connector, designed to transfer shear flow between the top flange of a fiber-reinforced polymer (FRP) tub girder and a composite concrete deck for bridge applications. In contrast with previously used bearing-type connectors, this system relies on a deformed FRP surface to transfer shear via direct interlock with the concrete deck. The connector is materially efficient, simple to fabricate, can be used with lower-grade structural or stainless-steel fasteners, and provides a high degree of interface stiffness. Six compression-shear specimens were tested to assess the connector fatigue resistance and ultimate connection strength. Additionally, two short beam specimens were tested in three-point bending, one of which was subjected to fatigue loading. Based on the compression-shear tests and short beam tests, the connection exhibited strength exceeding that predicted by AASHTO for frictional concrete-concrete connections. The connection strengths were significantly greater than the factored demand required by AASHTO for a typical model FRP bridge girder. The cyclic loading of the connection in both compression-shear and beam bending showed that connection stiffness and strength do not significantly degrade, due to the application of 1 x 10(6) to 6 x 10(6) cycles of traffic-induced factored fatigue load.
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