To answer one question about how the existing concrete is performing - it seems in excellent shape; I did not observe any signs of failure.
To answer a question about FRP - that is an idea I didn't think of yet, thanks! One issue about strengthening up the beams and column with FRP is we still...
Thank you all for the thoughts and comments. I did not think of the uplift on the existing column due to being so close - that is something to consider for sure, thank you.
I did consider the idea of not messing with it, but our live-only load increases about 30% - well over the 5% allowable...
You are right - the 2700 lbs per foot is both live + dead (worst load combination in this scenario). Live load is only 920 lbs per foot. It does make sense that the dead loads area already supported and we would potentially only be suppporting the new 5,000 lb load plus the live tributary =...
Hello!
This is the situation:
An existing house with a concrete beam approx 12"x24" spanning 16 feet.
The existing beam holds up approx 2,700 lbs/foot.
We want to add a 5,000 lb concentrated load above the beam.
We want to add a column directly under the 5,000 lb load.
Does this column...
Thank you for your replies - if someone reads this later on, I wanted to follow up with what I ended up drawing:
- I found the Clark Dietrich standard detail for E clips says to use a 7" clip for a 10" purlin, and the 7" clip does not have enough capacity.
- I specified a Simpson SJC8.25 that...
Thank you for the replies - KootK your logic makes sense.
XR250 - I would imagine that Clark Dietrich has accounted for this eccentricity to deliver the force as an almost pure shear to the web of the supporting member (that the 9 screws between the clip and joist act as a moment & shear...
Hello!
I am designing a carport using cold-formed steel as the roof joists (1000S350-68 at 40" o.c., spanning 20 feet) that are hanging flush from back-to-back stud sections (1000S250-68 back-to-back spanning 10 feet between posts).
I have used various software (Simpson CFS & AISIWin) that both...
I have seen similar to option B in moment frames. See the photo - it has steel plates welded to the end of each beam, and they are connected at approx 45 degrees. You can’t see well in the photos, but the outside corner has the plates extended beyond the beams about 6”, and another set of bolts...
Hi Drew,
I agree with you about not liking to screw into the end grain, but the wood code does allow it like you said with the reduction factor of 0.75. So I think you are right to just calculate the withdrawal and shear on the screws and find a screw that works. Personally I would pick...
Hi Imagine18,
I am taking the test in April 2018 and am facing the same thing... don’t want to buy the new AASHTO code. Did you end up buying the new or using the older code? Did you pass?
I am studying now using the NCEES provided practice exam and it seems like all the ASSHTO questions’...
I use Risa Connection, and I really like it. It is purely for connections, so you enter the members you are connecting and the forces, the connection plates (if any) welds, bolts, ... and you get a 3D model to verify your inputs. You can export the views to autocad with labels for details. It...
I figured out what I was doing wrong to get such large pressure values using ASCE7-05 equation (6-17).
Hopefully this can save someone the weekend stuck in the office I have had :)
You are supposed to use + or - 0.18 for your internal pressure coefficient to determine the windward and leeward...
Hello,
What I would do is make sure the building is at least as strong after the project as before - so if you're making a 3' opening in the wall, I would see what plywood was removed and what was the nailing pattern. Then I would calculate the shear capacity of that removed plywood and add...
Hello,
I am designing a 5 story wood framed hotel building approx 53' x 180' footprint. I am ending up with large pressures to design my plywood shearwalls for, and no difference in pressure between interior and corner zones. Is this correct?
Here are some details about the project:
I am...
Hello,
I am trying to figure out how much bottom-flange bracing to use on a LGS roof with no ceiling attached.
I am designing a car port that is open on all sides. I am in Houston, where I end up designing for 87 psf uplift.
I want to use light gauge steel roof joists, with a corrugated...
