I'm hoping to pick the brain of some more experienced and seasoned engineers. I'm working on a six story college campus building in Wisconsin that has had a 50' tower that was constructed on top of it. The tower itself spans to two sets of exterior concrete columns that seem to be part of the...
I'm trying to design a knee brace connection to this cold form joist that I can't really find any relevant information on. The section is two cold-formed channels measured to be 8" deep, spanning 13', and they are spaced 4' on center. The plans call out 60 SJ 16 with a design snow load of...
I've had some pretty good success modeling two way slabs in RAM Elements for flexure and shear. The one I'm working on now is from the 60's where everything is f'c=3,000psi concrete and fy=40ksi rebar. I find it interesting that the plans call out allowable steel tension and compression...
I'm hoping to get some mod guidance on this. I'm working on a project where significant rooftop equipment is right above this header. See below:
As you can see in the photos, the joists have already been tripled up (notice the difference in joist width between original and modified) but I...
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Expanding this referenced thread, how have people been handling this for existing structures that weren't designed with this provision in mind? To me it seems really odd to have to say a structure that was completely fine before now is screwed over when the gravity loads (5%)...
I'm in the process of designing a wall mount to an old unreinforced hollow masonry wall. It was built in the early 60's, so I'm not surprised about the wall construction.
Anyways, my calculations are showing it needs to be grouted solid to support the needed loads. We also don't have have...
I typically analyze existing concrete/steel structures. However, on occasion, I'm tasked with analyzing an existing brick/masonry structure. I'm hoping someone can provide some feedback on this particular table.
More often than not, I am using the first section, normal to bed joints...
I've got sort of an easy question (I'm hoping anyway). I'm working on an existing hollow core structure designed in 1969. I've been able to track down the load tables from the era (a 6412 that spans 22' - see attachment). This shows an allowable load of 62psf. The plans call out a 30psf live...
I am am designing a rooftop equipment platform which is supposed to connect to the rooftop structural system. This rooftop is constructed with a system of precast planks, steel beams, and steel columns. I plan on putting the platform directly on building columns, so globally I don't see it...
I am in the process of analyzing an existing composite deck building from 1973. In the plans, it is called out to have a design roof live load of 30psf and doesn't say anything about snow load. This site is in the UP right on Lake Superior, so the ground snow load is 70psf and the balance snow...
I'm currently in the process of analyzing a concrete foundation of a multi-leg water tower that was designed in the 1936. The plans have survived time and show a typical pad and pier foundation. The one thing that is odd to me is they call out rebar in the bottom pad, but all they show in the...
I'm looking to check into the capacity left of a CMU apartment building designed in 1979. In the area in question, the building only has bearing walls and no columns and the load is being applied on the roof. Rather than the building calling out an f'm of 1500psi, it calls out a different f'm...
