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Recent content by AK4S

  1. AK4S

    Structure behaves as an arch or flexural member?

    There is a past NDT report which provides concrete strength (estimated b/w 3300psi to 5000psi) and past field core info which provides the steel beam information, partial info on the wall rebar as well. Thank you for your suggestion regarding a Rigid Frame Approach. I'll have to look around to...
  2. AK4S

    Structure behaves as an arch or flexural member?

    Thank you for sharing potential approach for a FE model. Unfortunately there is no budget for trial and error on a detailed FE model and analysis. We'll have to justify that a simpler approach may not yield correct results and that that the FE model developed works as indented.
  3. AK4S

    Structure behaves as an arch or flexural member?

    I would not trust the reinforcement shown in the sketch entirely. Its a best guess by the folks who did the NDT using GPR data at the Wall, Springline and the Crown. So actual rebar extent could be different.
  4. AK4S

    Structure behaves as an arch or flexural member?

    Thank you for the clarification. I don't have info on the backfill to see if there could have been any potential thrust issues which could have led the OC designer to adopt this unconventional approach. Based on the profile of the underpass below, looks like there was limited room at the top...
  5. AK4S

    Structure behaves as an arch or flexural member?

    Yes, I don't have access to original calcs or design drawings from 1902, just sketches which were prepared by the team who did the NDT and field cores two decades ago to establish what the section looked like. Not sure how I would go about to model the concrete encased steel beam in the arch...
  6. AK4S

    Structure behaves as an arch or flexural member?

    The arching action would be stiffer I believe. But then what to do about the steel beams, they ought to have some purpose
  7. AK4S

    Structure behaves as an arch or flexural member?

    Although I can perform a preliminary check on both options unofficially, unless one option absolutely fails or gives a very high utilization, will be difficult to convince someone on why the worst case assumption was selected, since I might be underestimating the capacity.
  8. AK4S

    Structure behaves as an arch or flexural member?

    KootK: Thank you for your response. You definitely brought a few points on the table that I had not thought about. 1) OG designer didn't like / trust / understand arch action so they intended the beams to be the spanning element. Not sure about this, but maybe they added the beams in case the...
  9. AK4S

    Structure behaves as an arch or flexural member?

    I am working on load rating of an existing bridge structure; a reinforced concrete arch built in 1902. The structure has a short 7ft clear span with concrete profile, with 16” thick arch ring which encases 10” deep rolled steel beams spaced at 2ft on center spacing. See attached sections of...
  10. AK4S

    embedment/development length for drilled and grouted reinforcement using cementitious grout

    thread507-500937 I am running into the same query posted in the linked thread mentioned above. Bridge Project. Application: Embed Vertical rebar for a new concrete barrier into existing concrete below. Concrete barrier can see lateral load from vehicular collision. so rebar will see shear and...
  11. AK4S

    Live Load notes on Existing Building Drawings (different values for Beam and Slab)

    I am working on some rehabs in an existing building and trying to make sense of the Notes provided in the Structural Drawings for Live Load. See below extracts of the Structural Drawings dated 1960. Educational Building located in Massachusetts. Design Live Load = 100psf on beams, 150psf on...
  12. AK4S

    Canopy support to brick veneer

    @SWComposites: Not really easy to completely reject the product unless we can justify that there is no other option to use the product. @JLNJ: cutting the plate short of the brick will create a 12" cantilevered plate which can lead to undesirable deflections under the load. @WinelandV: I agree...
  13. AK4S

    Canopy support to brick veneer

    The plate warping has a big delta. so I was thinking of removing an entire brick course at the plate elevation and solid grout it while accommodating the warped edge to fit within the brick veneer: Any thoughts/concerns on this approach?
  14. AK4S

    Residential Parking Retaining Wall Barrier

    How about using highway W-beam guardrail?
  15. AK4S

    Cantilevered Beam to Support Roof Guardrail System

    Agree with SRCELL. This detail puts torsion into the perimeter W310 beam, so you need to either ensure the beam can take this torsion without excessive rotation or find a means to restrict torsion in the beam.
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