Overload truck wheel load distribution on bridge decks.

Overload truck wheel load distribution on bridge decks.

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Overload truck wheel load distribution on bridge decks.
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    NTL-FREIGHT-Trucking Industry ; NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures ;
  • Abstract:
    There is a need to accurately analyze the load effects on bridge decks from permitted overload trucks on Michigan’s roads. The AASHTO Standard Specifications for Highway Bridges, 17th edition, provides a distribution width of live loads when reinforcement is parallel to traffic in section 3.24.3, but not when reinforcement is perpendicular to traffic. There is a distribution width factor, E, for cantilever slabs given in section 3.24.5; however, the structural action for this case is different than that of a continuous deck slab over multiple beams. In the Bridge Analysis Guide, 2001 edition, it is stated in Example 9, Bridge Deck Rating For Designated Loading, that, “Based on study of the AASHTO method, the moment effect of the wheels of tandem axles spaced at 3'-6" will overlap, and hence are additive.” The study of the AASHTO method was basic and a more detailed method is needed to correctly model wheel loading from overload trucks on bridge decks. A detailed method for accurately modeling wheel loading from overload trucks will be developed for bridge decks, followed by a simplified approach that can be used to analyze bridge decks for these overloads.
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