Axle equivalent transverse loading on segmental bridge decks.
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Axle equivalent transverse loading on segmental bridge decks.

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  • English

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    • Abstract:
      For a prestressed concrete segmental box girder bridge, both design and load rating are determined by

      longitudinal and transverse analyses. A transverse analysis is performed for the top slab, typically by

      using Homberg charts (an engineer’s design tool), to account for transverse bending effects due to truck

      wheel loads. The FDOT Office of Maintenance issues thousands of permits annually for heavy trucks.

      These trucks may have different axle weights and spacings than the trucks that are analyzed in the

      engineer’s design or load rating.

      In this research, a Homberg-based tool was developed in Excel for analyzing vehicles for their effect on

      transverse bending moments in a prestressed concrete segmental box girder bridge. The tool allows the

      user to analyze vehicle loads quickly and provides a simple way to compare effects of different

      vehicles. For example, the effects of vehicles that were analyzed in the designer’s load rating could be

      compared to vehicles with axle weights and spacings that were not analyzed in the initial load rating.

      In addition, Finite Element Modeling (FEM) was performed to study the effect on transverse bending

      moment of elements such as barriers, barrier joints, diaphragms, supports, and expansion joints. The

      effect of axle load spacing was also studied to give insight into the Office of Maintenance’s formerly-used “8-foot rule.” Calculated bending moments from Homberg analysis and FEM were compared for a

      few “Blanket” Permit Vehicles. “Blanket” Permit Vehicles are those vehicles permitted to travel an

      unrestricted number of times on unrestricted routes within one calendar year.

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