United States Department of Transportation
i
Cross-infrastructure learnings for alternative bridge system designs : a case study on the hybrid composite bridge system.
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2015-04-30
[PDF-1.35 MB]
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Abstract:The hybrid composite beam (HCB) technology has been presented as a system for short and medium span beam bridges as an alternative to traditional materials such as concrete and steel. A HCB consists of a concrete tied arch encased in a fiber-reinforced polymer (FRP) shell. When compared to traditional materials, the HCB system is lighter in weight, which allows for multiple members to be transported on a single truck and smaller cranes to be used during construction, and even reuse of existing substructures. In addition, the protective nature of the FRP outer shell provides additional resistance to corrosion for the reinforcement internal to the system, potentially offering an extended lifespan over conventional girders. Similar to other beam-type bridges for highways, the HCB system is made composite with a conventionally reinforced concrete deck. The investigation presented herein was limited to the evaluation of the in-service performance of a HCB bridge constructed in Virginia by the Virginia Department of Transportation. This bridge was evaluated for highway applications, but provided critical information related to the overall system performance that is also relevant to railroad and transit applications. These performance characteristics include lateral load distribution, dynamic load allowance and internal load sharing mechanisms inherent to the HCB design. Results from a live load testing program are synthesized in this report along with considerations for future railroad applications
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