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...
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?
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...
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...
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...
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...
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...
hardbutmild - I don't see a file attached
After reviewing ACI I see that a linear stress-strain assumption is valid up to 0.45 f'c, so I'll attempt the solution first assuming linear elastic behavior and make sure the strain is below that limit. Other sources, like Reinforced Concrete by Park...
Assuming linear stress distribution in concrete solved my issue, the forces now balance! I now realize how silly I was for using the elastic method to find stresses and the Whitney stress block for concrete forces and being confused that the values didn't match up... Hindsight is 20/20 and all I...
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...
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...
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...
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...
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...
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
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...
