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  1. MegaStructures

    exposed footing due to incorrect soil levels.

    So... the CMU wall is meant to support the soil? I don't understand, this seems... dangerous
  2. MegaStructures

    Abaqus_Beam Column connection

    What data are you using to tell you the "upright and connector are starting to behave as a fixed connection"? Are you plotting a force-displacement curve, or are you trying to determine the connection behavior by looking at the deformed shape? By the way, I think this would be a fixed...
  3. MegaStructures

    Design

    Probably do not design a reinforced concrete structure if asking on a forum "what reinforcing details need to change"? Surely, you aren't the EOR?
  4. MegaStructures

    exposed footing due to incorrect soil levels.

    I don't see what is providing lateral stability to the CMU wall, am I missing something? How is the soil from the slope above not going to push over the CMU?
  5. MegaStructures

    Upper Floor Garage Gym

    Thank you, everyone, for contributing. It was fun to consider this scenario, and I think we reached a general consensus that the entire gym area would need to be designed for significantly elevated loading (whether that's 100 psf, 125 psf, or more) as well as concentrated loads from dropping...
  6. MegaStructures

    Column Buckling

    I believe that even with advanced FEA software, it is challenging to accurately predict the inelastic buckling capacity of a compression member. The primary difficulty lies in properly accounting for initial imperfections, which significantly influence buckling behavior. While there are several...
  7. MegaStructures

    Abaqus_Beam Column connection

    It might help if you provide a diagram of your model
  8. MegaStructures

    Upper Floor Garage Gym

    What structural system did you use for the home gym you did above the garage?
  9. MegaStructures

    Upper Floor Garage Gym

    Thanks for the comments. In this case, a home gym refers to free weights used primarily for powerlifting (squat, bench, and deadlift), with the potential for dropping a bar from a standing deadlift. While they won’t be lifting 2,000 lbs, using reasonable assumptions for stopping time, a 500 lb...
  10. MegaStructures

    Upper Floor Garage Gym

    Hello, I am a licensed structural engineer specializing in steel and reinforced concrete, but my question is related to wood framing. I have a friend building a residential home (CMU walls and wood-framed floors) who asked my opinion on placing a home gym on the second floor. I don't plan on...
  11. MegaStructures

    Stress in Cover Plate in Uncracked Concrete Beam

    Celt83: Great breakdown! A little bit intimidating and probably overkill for my application to actually integrate over the cross-section; I appreciate the effort you put into the post! Thanks for the reference to Hognestad's, I had the equations written down from my old class notes and did not...
  12. MegaStructures

    Stress in Cover Plate in Uncracked Concrete Beam

    ...is below that limit. Other sources, like Reinforced Concrete by Park and Paulay 1975 state that concrete can be assumed to behave linearly up to 0.7*f'c and can be accurate up to as much as f'c. To be safe I will use the lower values in ACI and if the stress in the concrete exceeds 0.45f'c I...
  13. MegaStructures

    Stress in Cover Plate in Uncracked Concrete Beam

    ...elastic method (σ=My/Itransformed) Calculate concrete stress using elastic method (σ=My/Itransformed) Calculate steel and concrete force using F=σ*A Calculate the strain of the concrete to ensure it is less than 0.0015 (half of 0.003, use formula ε=σ/Ε) If the concrete strain is above 0.0015...
  14. MegaStructures

    Stress in Cover Plate in Uncracked Concrete Beam

    Hi Retrograde! So below strains of 0.003 I should find the force in concrete by calculating the area of the "stress triangle" (1/2*height*max stress)? I tried and tried to embed the image, but the purple camera button failed me. For some reason I'm getting no response from it. I would blame it...
  15. MegaStructures

    Stress in Cover Plate in Uncracked Concrete Beam

    Here's an image of the cross-section. “The most successful people in life are the ones who ask questions. They’re always learning. They’re always growing. They’re always pushing.” Robert...
  16. MegaStructures

    Stress in Cover Plate in Uncracked Concrete Beam

    Hello, I need some help determining the stress in a "stiffening beam" at service level loads. At the service level moment, the concrete is uncracked. I'm not exactly sure why, but the fact that the concrete is uncracked has made this analysis extremely confusing to me, so I wanted to get a...
  17. MegaStructures

    Effective Length Factor for Double Angles Bolted to Gusset Plate

    I agree CANPRO, but the fun starts when you are dealing with someone elses design/construction and have to squeeze a few extra pounds out of it :) “The most successful people in life are the ones who ask questions. They’re always learning. They’re always growing. They’re always pushing.” Robert...
  18. MegaStructures

    Effective Length Factor for Double Angles Bolted to Gusset Plate

    CANPRO, I think you are thinking of buckling of the actual gusset plate, which I agree your memory is correct or at least close on the effective length factors for the plate. dik, Hopefully I am understanding your explanation correctly. It appears to me that you are agreeing with me that the...
  19. MegaStructures

    lateral load resisting systems

    What kind of modular construction? “The most successful people in life are the ones who ask questions. They’re always learning. They’re always growing. They’re always pushing.” Robert Kiyosaki
  20. MegaStructures

    Hollo-Bolt Experiences/HSS Splice

    I've used Hollo Bolts several times; the steel workers have hated them every time. Welding seems to be the preferred solutions for the workers I've asked that have tried both. It's unfortunate, because I think the Hollo Bolts are pretty cool, I was excited when I first found them, since we have...

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