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  1. PatrickM111

    AREMA DPG Bridge Cross Frame Design for Derailment Load

    I'm designing a new 64' DPG bridge for Cooper E80 load and sizing the "X" configuration cross frame diagonals (at 60 degrees with the vertical) with top and bottom horizontal braces (cross frames at 8' spacing with 8' c/c girders) and the derailment loads (AREMA MRE Article 15-1.3.10) I'm...
  2. PatrickM111

    AREMA DPG Bridge Cross Frame Design for Derailment Load

    I'm designing a new 64' DPG bridge for Cooper E80 load and sizing the "X" configuration cross frame diagonals (at 60 degrees with the vertical) with top and bottom horizontal braces (cross frames at 8' spacing with 8' c/c girders) and the derailment loads (AREMA MRE Article 15-1.3.10) I'm...
  3. PatrickM111

    AREMA Rating Steel Bridge Load Combinations

    I have to complete the rating of a steel truss bridge and since AREMA Manual for Railway Engineering does provide load combinations for steel structures, it's a bit of a challenge. There are no centrifugal forces or CWR, therefore the only loads I can see including are: DL, LL, Imp, Wind...
  4. PatrickM111

    Slenderness Ratio & Compressive Resistance of steel bridge members

    Steel compression members for bridges are limited to a slenderness ratio of 120. If I have diagonal truss members that exceed this limit, how do I obtain the compressive resistance of the member, as code formulas must satisfy the limit of the slenderness ratio? Right now, I'm thinking that...

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