Recent content by JNEnginr

Thanks for everyone's feedback, though I'm still not sold one way or the other.. Here's a plan view: Image#1. 1st floor plan. Red line is the extents of the vault. Dividing dashed lines are concrete walls. I'm wondering if the bottom portion of the vault is a later on addition. Image...

The room above all this is completely open...i'm stumped

Nope, No big beams on the 1st floor ceiling (these beams are all in the basement). Just the Vault walls

In the 2nd picture, it's a short span across the corridor, about 8ft. Maybe the concrete slab is strong enough to span that short distance, but since the corridor is 20ft long, the drop beams, while unsupported, make it stiff enough so it doesn't dip in the long span direction? Does it work...

But the dropped beams aren't supported?

Hey Everyone, Take a look at these two photos and see if you can shed some light on what's going on here. This is an old building, early 1900s I believe. Existing foundations are multi-wythe brick. Floor construction is concrete slab/beams, hollowed out with hollow terracotta block. See...

My thoughts exactly on the slenderness. Just an i-beam strut is what i had in mind, so i'd end up with two stacked x's.

That's awesome. And so at the locations where the independent buildings met, that's where you did the double lines of support, each I assume having their own X-Bracing. Did the owners just work their layout around the cross bracing? I guess since the bay was so large, they could still pass...

For tall structures as well? Just one big X, 25ft long, 40ft tall? (I'm referencing to previous post) And if you have glazing, do you find that the moment frames are effective for structures that tall?

Dik, Can you clarify what you meant when you said use real X-Bracing?

It's definitely class A, maybe the architect misspoke when he said 4 hours. If you look at the 1st picture i posted, see how the steel girder looks like it frames into the side of the concrete column by sitting on a seat, not the column itself? And if you look at the column on the far left...

Hey Everyone, Wanted to provide an update on this and ask for more feedback. Seems the reason for the concrete around the columns is due to the warehouse requiring a 4hr fire rating. I feel like i have two options: -Design the HSS columns for the load, and then just encase in concrete...

I agree, encasing the bottom of the columns in concrete is a must. As for the X-Bracing, do you still use that if you're using Tilt up Precast concrete walls? Shallow Foundations, 3000PSF. Anyone else have feedback on this?

Here's another pichttps://files.engineering.com/getfile.aspx?folder=04cc1a72-5b01-4100-b495-65d10cbbbf91&file=Screenshot_2023-01-05_134640.jpg

Hey everyone, Happy New Year! I'm looking to design an addition to an existing warehouse. 90ftx350ft. Exterior Walls will be 40' tall Tilt up Precast Concrete. Roof is metal deck on steel bar joists supported by steel joist girders supported by columns. What I'm debating is the interior...