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Recent content by 3Fan

  1. 3Fan

    Hiring a bridge engineer?

    We have worked with Genesis as well and would highly recommend. I have visited US Bridge's fabrication facility. It was an amazing shop tour.
  2. 3Fan

    Falling tree load case

    The USACE published a document called "Maximum Impact Force of Woody Debris on Floodplain Structures" back in 2002. Though not the same situation as what you are describing, there may be some relevant information for you from their research.
  3. 3Fan

    Extent of negative moment reinforcement

    Our DOT runs #4's in the top mat longitudinally for the entire length of the deck, then adds a #6 in between the #4 for negative moment steel.
  4. 3Fan

    Extent of negative moment reinforcement

    Assuming you have steel girders, AASHTO LRFD 6.10.1.7. However, I like BridgeSmith's approach better. Our DOT stagger every other rebar 3' longitudinally.
  5. 3Fan

    Deep Beam Analysis Software

    I have used the STM-CAP spreadsheet you list above once or twice. It was sponsored by the DOT we do work for. It is fairly simple to use, but yes you will need to determine your reactions with another program. The Project Report provides several worked examples using the spreadsheet. The...
  6. 3Fan

    which bearing A or B is best option for a bridge fixed elastomeric bearing?

    We had designed replacement pads with Method A for a rehab project. After the contractor started sand blasting the beam ends he started blowing basketball sized holes through the webs. The fix was to encase the beam ends in concrete, but this obviously added significant load to the bearings...
  7. 3Fan

    28 ft retaining wall

    How about a tangent shaft wall with a precast panel on the front to make it look pretty?
  8. 3Fan

    Anchored End Span Bridge

    Here's an article about a local bridge that has anchored end spans. Is this the type of bridge you are referring to? http://www.aspirebridge.com/magazine/2013Spring/DodridgeStreetBridge.pdf There have been a few more done around here that I have plans for.
  9. 3Fan

    AREMA Chapter 8 Crashwalls

    AREMA indicates that Section 2.1.5 was updated with the 2019 edition. Instead of buying the entire manual you can just purchase the chapter you need for $290 (non-member price)
  10. 3Fan

    Jointless abutment details for long curved bridges?

    When we work for the WVDOH, we can turn a single row of H piles the strong way and call it semi-integral. I haven't figured that one out yet. In Ohio, you have a rigid foundation for a semi-integral configuration like 2 rows of piles, shafts, or spreads. BridgeSmith, were there and guides...
  11. 3Fan

    Jointless abutment details for long curved bridges?

    Sounds like an awesome book to cure insomnia! On semi-integral conversions our DOT is using a very similar detail to what STrctPono posted above. A geogrid wall under the approach slab with a gap between the diaphragm and the geogrid wall. Relieves the passive pressure. WVDOH also uses a...
  12. 3Fan

    "Remote" assessment of bridge footings

    We're working on a very similar scoped project right now. The client wanted us to verify that the abutments were sufficient to carry the pedestrian loads. No existing plans and no way were were going to dig down to see what the footings or piling was. We did not core the concrete or the...
  13. 3Fan

    Jointless abutment details for long curved bridges?

    bridgebuster, I do not work in Iowa. Our DOT (Ohio) was looking into utilizing integral or semi-integral abutments on horizontally curved bridges and I was doing some research and stumbled across that document. Typically here, we do not use integral abutments if the abutment height is more...
  14. 3Fan

    Jointless abutment details for long curved bridges?

    Iowa State did some field monitoring of curved bridges with integral abutments. Their report can be found here: Link
  15. 3Fan

    Old Railroad Bridge for Bikepath Bridge

    Just an update on this project. I was able to visit the site and get up on top of the bridge. The truss inside to inside width will be our controlling width of about 12'. The girder spacings vary from 6.0' to 6.5' to 8'. So the overhangs will vary. One snag we noticed at the site was that...
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