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  1. BridgeSmith

    Concrete hinge or pin

    We've used a similar detail to hinge columns at an abutment cap, except that in our detail, there was only a small area of concrete contact at the center, and the remaining width had a gap filled with sponge rubber. We didn't need a waterstop.
  2. BridgeSmith

    Old Through Plate Girder Bridge

    In the US, load ratings are very specific in their process and how the results are defined and reported to the feds. Structural evaluations in some ways have more latitude.
  3. BridgeSmith

    Retaining concrete reinforced block wall

    That's the typical limit where the loading/design is independent. They can be closer than that; they just need to be designed considering that they interact. A proper design can account for any distance between the walls. It may require more extensive excavation for some configurations.
  4. BridgeSmith

    Retaining concrete reinforced block wall

    You're referring to a block-faced MSE wall? If so, I agree that seems like the best option.
  5. BridgeSmith

    Impact of Abandoned Pile on Pile Group Behavior

    If that turns out to be the case, I would say the only concern is hitting concrete that flowed out into a void outside the shaft. Other than that, the existing shafts will react as a pillar of really stiff soil adjacent to your new shafts.
  6. BridgeSmith

    Impact of Abandoned Pile on Pile Group Behavior

    What type of piles are the existing? What are your new piles? Will the new piles be end bearing, friction, or driven to refusal?
  7. BridgeSmith

    box culvert analysys

    Multiple units to get the 10m width would be fine, but the 6m height would likely put it out of the range of sizes for a precast section, at least in most or all of the US. Casting concrete walls that high would be a significant challenge, as well. Our preferred option for something with the...
  8. BridgeSmith

    Retaining wall repair rec

    If you can excavate behind the wall, the geofoam option can probably be made to work, but you consider reinforcing the soil mass - creating a mechanically stabilized earth (MSE) wall behind the block wall, also. We typically have the internal design done by the geogrid supplier, so we only deal...
  9. BridgeSmith

    box culvert analysys

    I agree this is impractical to do as box culvert. Concrete arch, steel arch, or a bridge would be the more economically feasible options. I see you list your job as "Student". If this is a school project, it should be posted in the Student section.
  10. BridgeSmith

    Correct way to define a cable sag

    How the sag is measured does not change regardless of the percentage. It's a function of how the analysis is performed. The percentage of sag is a design parameter chosen to meet the limitations and goals of the installation (clearances required vs. capacities of the components).
  11. BridgeSmith

    Correct way to define a cable sag

    To be consistent with the typical analysis of a catenary span, I think the 6% should be measured as S3. Could use S1. That said, in a typical analysis, the dead load is a small component of the total, with the design wind load being 80% or more. Given the very approximate nature of estimating...
  12. BridgeSmith

    External anchorage of reinforcement - is this feasible?

    Like jhnblgr, I'm not understanding the issue here. At the load position, the moment is zero, and increases linearly to the support location. The capacity of the bar with partial development can likewise be assumed to increase linearly from the face of the concrete (the increase in development...
  13. BridgeSmith

    Steel Bearing - bridge Anchor Rod Design

    Yeah, darn it!
  14. BridgeSmith

    Moment Frame on Asphalt / Wheels?

    If the pressure is high enough, it may squeeze some oil out of the asphalt, and you'll have an oil slick, anyway, even if there wasn't one before.
  15. BridgeSmith

    Residential Load Bearing Wall Removal (A basic task & possibly an ignorant question.)

    If mitigation of the lateral support lost is required, it may be possible to increase the shear capacity of adjacent wall sections, in lieu of designing and constructing a moment frame.
  16. BridgeSmith

    Steel Bearing - bridge Anchor Rod Design

    For anchor bolts that I've seen where the bearing needed to be fixed and not move, but oversized holes were needed for installation, a heavy plate washer with a standard sized hole was installed over the anchor bolt and welded to the masonry plate. Not sure how or if that that would impact the...
  17. BridgeSmith

    Steel Bearing - bridge Anchor Rod Design

    Not sure whether it's allowed for railway bridges, but on a highway bridge, if we used that configuration, we would consider the resistance provided by shear deformation of the neoprene pad, up to where it first slips under minimum loads. That would help some. For the bolts in sign structure...
  18. BridgeSmith

    Old Through Plate Girder Bridge

    You'll have to measure everything to model the cross sections. However, assuming this was a bridge carrying standard freight rail loads, unless there's substantial section loss in key locations, the load carrying capacity for pedestrian loads or maintenance vehicles is unlikely to be a limiting...
  19. BridgeSmith

    Restoring Gold Standard Science

    How ironic that the writer rails against "state-dictated science", when it's so obvious that that's what we've had for many decades. At least in the realm of vaccines, the interference of government in science is becoming more obvious every day. Just as an example, the writer decries "Calls to...
  20. BridgeSmith

    Nuclear Now

    Some basics about Thorium vs Uranium nuclear: Is thorium safer than uranium?

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