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  • Users: DCBII
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  1. DCBII

    Contractor Cut Through Diaphragm Chord

    I have a 1-story Special Reinforced Masonry Shear Wall building where the electrical contractor cut through the diaphragm chord reinforcement multiple times to make openings for conduit. Looking for ideas on how to repair this. The chord steel also acts as horizontal reinforcement for the shear...
  2. DCBII

    Foundation Stability Factors of Safety

    Traditionally, a factor of safety of 1.5 has been provided for overturning, uplift, and sliding. The introduction of the 0.6D term essentially applies the factor of safety of 1.67 for you. The unintended consequence of using a 0.6D combination is that the bearing pressure gets hit with the 1.67...
  3. DCBII

    Existing Corbel

    I've got a situation where I'm being asked to expand an existing structure. The existing structure was built with a corbel to plan for future expansion. The only problem is, the existing corbel is not detailed correctly. The anchor bar is not welded, and the ties do next extend 2/3*d down the...
  4. DCBII

    Leading structural analysis packages

    I like PyNite, but I am a little biased, since I created it. I designed it to be easy to use. It covers most of the basics: frame/truss analysis, springs, plates, load combinations, and 3D model rendering. There are examples in the GitHub repository showing how to use it: PyNite Examples.
  5. DCBII

    Fully vs partially composite beam

    I'd add that the beam needs to be sized to limit deflection before the concrete has gained strength and composite action is available. This can lead to a larger beam size that doesn't warrant going fully composite.
  6. DCBII

    Gabled Roof Thrust

    I'm working on a steel gabled roof design (see attached layout). At the ridge line there are steel ridge beams supported by steel columns. I did that to eliminate/reduce the thrust applied by the roof beams to the exterior CMU walls. I have an attic that acts as a rigid diaphragm (concrete over...
  7. DCBII

    Single Span Crane Beam with Cantilever and Cap Channel

    The purpose of the cap channel is to provide lateral support for the compression flange as the crane applies side thrust. In the case of a cantilever, the compression flange is on the bottom, and the cap channel is ineffective. I would treat it like an ordinary S beam. You have 2 issues to...
  8. DCBII

    Soil Seismic Load Questions

    Consider a multistory structure with a basement. Assume the geotechnical engineer has given you a soil seismic load against the basement wall. That soil seismic load is resisted largely by the ground floor diaphragm at the top of the basement wall, which carries it out to the basement shear...
  9. DCBII

    Jacketing or Strengthening for Existing Columns

    MSUK90: 1. I still don't like it - extra unconfined concrete. I hope its not in a seismic region. 2. Expecting the contractor to do a good job bonding concrete to concrete is playing with fire. Lot's of surface preparation and probably some pull-testing required to validate it. 3. Have you...
  10. DCBII

    Jacketing or Strengthening for Existing Columns

    I should clarify... jacketing with unreinforced concrete would concern me.
  11. DCBII

    Coding Microsoft Excel

    Jupyter and Spyder are both great IDE's for Python. xlwings runs in VBA's IDE.
  12. DCBII

    Jacketing or Strengthening for Existing Columns

    I would be very hesitant to jacket columns with concrete. First, the concrete outside the rebar cage is unconfined and is the first to crumble and fall off when overstressed. The further away from the cage, the larger the cracks. In high seismic regions you can usually plan on losing any...
  13. DCBII

    Coding Microsoft Excel

    You'll be happy to know that the VBA integrated development environment (IDE) has has virtually no changes in the last 14 years, although any ActiveX controls such as buttons embedded in your worksheets may be broken. Microsoft has been trying to kill VBA for years with no luck. They've used a...
  14. DCBII

    Metal deck diaphragm shear transfer at ridge of a gable roof with open web steel joist.

    Deker: The OP was concerned about rollover strength of the joists. For diaphragm shear perpendicular to the ridge, the shear is parallel to the joists, and there are no rolling forces. The HSS serves no purpose in either direction unless the deck is dropping diaphragm shear into a LFRS at the...
  15. DCBII

    Metal deck diaphragm shear transfer at ridge of a gable roof with open web steel joist.

    I think we're over-complicating this. Why are we taking the diaphragm shear through the joist seats at the ridge? Is there a lateral force resisting system running along the ridge? In that case the HSS members would make sense to me, and they would be collectors. I usually try to avoid a...
  16. DCBII

    Castling pile cap while driving other piles

    What do the contract documents require? 28 days? You can ask for a change, but that's up to the design engineer if 28 days is in the contract documents. A good design engineer will try to work with you, recognizing that they may need to come to you for something in the future. It's a two-way street.
  17. DCBII

    Beam Over CMU Non-Bearing Wall

    EngineeringEric This is a wastewater treatment plant building. The spaces on different sides of the wall have different classifications. One side has potential for H2S gas, and the other side is an electrical room we don't want gases getting into.
  18. DCBII

    Beam Over CMU Non-Bearing Wall

    I have a CMU partition wall with wide flange roof beams over it. The CMU is notched around the roof beams so they can pass over the wall without bearing on it. I need to seal off the spaces on each side of the wall from each other. How do I seal off the pockets around the beam? I can't use...
  19. DCBII

    MITC4 Plate Bending Elements

    upuri1213: I don't have a lot of spare time at the moment to help. I may be able to point you in the right direction if you describe your problem. ESPcomposites: Shell elements are challenging to formulate. I've found the MITC4 to be a good element so far, except when calculating stress...
  20. DCBII

    MITC4 Plate Bending Elements

    nlgyro: Are those most recent plots you posted "smoothed"? What does the plot look like unsmoothed? Does it look more like a step function? After looking into it further, I think the MITC4 element may be reporting center stresses at the corners, which explains the divergence at the supports. At...

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