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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...

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...

Thanks for the tips guys! I am using a structural analysis program with a moving load generator, therefore I will create force envelopes in order to identify the "worst case" members. From what it sounds like, I probably will have to the check the wind load cases with the braking (or...

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...

Actually, it's an existing bridge and we're doing the structural evaluation, so it's a matter of determining the Demand/Capacity ratio. Right now, the problem is trying to figure out the resistance of existing diagonal member built-up of 2 angles not placed back-to-back, but like a C-shape with...

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...