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  1. bridgebuster

    Old Through Plate Girder Bridge

    I agree with Rod. If the bridge carried trains it can certainly carry pedestrians or an H-10 truck. You can't get away from field measurements. Side plates add a lot of capacity.
  2. bridgebuster

    Old AASHTO (AASHO) Standard Specs

    It seems I have a pdf of the circa 1939 manual.
  3. bridgebuster

    Old AASHTO (AASHO) Standard Specs

    Here's an excerpt from a PCA manual called "Concrete Culverts & Conduits", circa 1939 (There isn't any date on it but there's a footnote referring to a 1939 magazine article. Also attached is a 1949 PCA article for vertical pressures on culverts under concrete pavement.
  4. bridgebuster

    Old AASHTO (AASHO) Standard Specs

    Unfortunately, my co-worker can't open his copy either.
  5. bridgebuster

    Old AASHTO (AASHO) Standard Specs

    OSU - I have a hard copy of the 1961 specs. I had a copy of the '31 specs. Unfortunately, the company changed the subscription service recently and I'm unable to open the electronic file. Next week I'll check with one of my coworkers to see if he can open his version.
  6. bridgebuster

    Suspension Bridge Design Examples

    Here's a copy of D. B. Steinman's 1929 book, still relevant.
  7. bridgebuster

    How will you assess a bridge for oversized load transportation?

    https://en.wikipedia.org/wiki/Influence_line
  8. bridgebuster

    How will you assess a bridge for oversized load transportation?

    draw an influence line.
  9. bridgebuster

    "Bridge Engineering Vols. 1 & 2" by J.A.L. Waddell

    If you work on older bridges the ancient texts come in handy, by shedding light on long list terms, understanding why certain things were done, etc. A few years ago I did a superstructure replacement of a 2 span bridge designed in 1940, the pier design was exactly what Waddell recommended. In...
  10. bridgebuster

    Field welding vs bolting to existing steel structures

    How old is very old? If you choose to weld- I prefer bolts- you might want to consider taking a coupon and testing it to ensure it’s weldable.
  11. bridgebuster

    Min free distance between girder and wall

    I'm not aware of any AASHTO provisions. On new NYSDOT bridges, centerline of bearing to face of backwall is usually 1-3" or 1'-6". The girder standards call for the centerline of bearing to be 8" from the end of the girder and the deck standards call for the deck to overhang end of girder by 6"...
  12. bridgebuster

    Min free distance between girder and wall

    If you're designing for particular DOT check their standards. Yes, the distance from the end of the girder should be larger than the displacement plus some fat.
  13. bridgebuster

    Truck loading with lane load

    A 20T truck is H20, two axels spaced at 14;'. The closest recognized legal load to a tandem 20T truck is AASHTO Type 3, which is 25T. The first axle is 16k, the next axle15' away is 17k, the third axle is also 17k, & 4 feet away. You could use that configuration and proportion the loads down to...
  14. bridgebuster

    Semi-integral Abutment Design

    Correct, but it assumes the integral abutment is a free standing column, which seems overly conservative to me. Meanwhile, the longitudinal deflection for the bridge as currently designed is less than an inch.
  15. bridgebuster

    Semi-integral Abutment Design

    Thanks for the replies; as I said above I needed a sanity check or perhaps a sounding board. My initial response to him was "B@!!$#|+" There's enough passive pressure to resist 80% of the seismic force and I wasn't even considering shear resistance of the elastomeric bearings. Then he proceeded...
  16. bridgebuster

    Semi-integral Abutment Design

    We have a project under construction. 175' long integral abutment bridge. Due to a number of issues related to pile driving at one abutment, the owner asked about changing one abutment to semi-integral and using drilled-in micropiles. The designer said it was impossible because under an extreme...
  17. bridgebuster

    Cost estimating software recommendation.

    Our estimating department also uses HCSS.
  18. bridgebuster

    Temporary Fencing Requirements

    We have a project with templates fence. It’s designed for wind per ASCE 7-22. It’s in an area no accessible to the public. Depending on your situation, you could try a load case with an eccentric 250 pound load to simulate a person climbing on it.
  19. bridgebuster

    Seismic Design for Stone Blocks

    This is drawing showing the anchoragehttps://files.engineering.com/getfile.aspx?folder=d5726a61-c906-474b-ab8d-3bb4342bf8cf&file=BPU_Drawing.pdf
  20. bridgebuster

    Seismic Design for Stone Blocks

    see attached calculations. it's from a project we did 20 years ago. Stone veneer on a retaining wall in NYC.https://files.engineering.com/getfile.aspx?folder=cc279838-4a52-468d-bdd6-e69543c39e47&file=Panel_Attachment_Calculations.pdf

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