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Hello, I have an existing strip/office w/ K-Series joists @ 6’oc w/ 20ga B deck (20/20 loading). Needs new 280# EF w/ 24x24 curb opening for 40” diameter exhaust. My question is with this size of opening/relatively limited weight is there an ideal installation for the deck reinforcing? I’m...

Bummer, you’d think they’d have 3” covered.

XR, you can try a Simpson Stud Shoe SS1.5 that should work. They’re about $8/ea and will be easy vs drilling 1/8” steel.

Great insight from everyone on here for an extremely challenging engineering problem - annoying that homeowners think it’s an easy one and architects think they can handle it. You really have to have a mastery of engineering principles and absolute confidence to take these projects on. One thing...

I wouldn’t see the justification for installing a ridge beam unless there is measured deflection or deterioration. Best of luck, always tough decisions to be made in this profession.

Never seen a chord lose a whole leg. The quality assurance required for extensive welded repairs on 10-12 48’ joists would seem very difficult to achieve. Too many different conditions with different variables to keep track of, too many obstructions to document — you’ll likely do better with...

@liam1369, since you'd indicated you do not have much experience with "concrete frames", it sounds like an opportunity to steer the project towards larger columns that stick out into the classrooms and do not fit in wall lines. Secondly, I'd say you really shouldn't approach the design using the...

Strange looking W36s.

You mentioned that “pennies are calculated in the construction industry.” Did you have experience with previous crane tower work where someone balked at the costs? It seems something as critical to the success of the project would be one of those expensive costs that all parties would be willing...

Agree that medeek would be a great resource.

At least 250 would be warranted. Forklifts all day long and heavy manufacturing, punch presses and the like. I was able to find a Google time-lapse, separate from Google Earth which definitively shows the roof appear in 1999. It showed up on a relatively pixelated map as an unmistakeable 900' x...

Thanks @Spanky7, I found other posts here resembling your timeline - some saying earlier than '04/'05 and all stemming from Northridge (94) as @PhamENG indicated. I analyzed the typical bay for 250 psf LL as a benchmark and determined the typical beam fails with a non-composite A36 design and...

Thanks @canwesteng, I appreciate your input. I was having trouble seeing the advantage of the building's designer selecting a composite deck type for non-composite construction. It seemed that the composite deck type would be significantly costlier for an addition of this size versus say a 2C...

Hello, I'm analyzing a 120,000sf factory floor, 2VLI 8" total thickness, that appears to be built for WWIII for a new piece of machinery. It was constructed as an addition with W24x55s @ 6'-3" o.c. x 30' w/ W33 Girders spanning 25'. The steel is fireproofed and from historic Google Satellite...

One more for never seen. Most would agree the first order of business should be to get a licensed structural engineer to visit the site and do a proper assessment.

Please note this is not on a composite deck, but rather a 12" slab according to an update from the OP. However, the guardrail system in question still weighs approximately 185 lbs for a 4' segment based on a quick estimate, nearly 46 plf or the weight of a small building girder. What I see...

@Ron, most guardrail “systems” do not have the luxury of the top rail anchored at each end - in many cases they’re long runs with jogs and the like. Unfortunately, the battle against the full moment has to be fought at the base with pure cantilevered posts - no getting around it. Fortunately...

Engineering3DTek, please note SandwichEngine’s post and photo above. Guardrails are a critical life safety mechanism and require considerable tried and true strength, no matter what computer software says. Staggering the anchors to create somewhat of a “force couple” may be an improvement over...

You mentioned the architect was fine with the look. If you’ve got that freedom, you should be able to present a design for them to consider which may be more conventional using intermittent posts, square base plates having (4) anchors, top & bottom rails, steel pickets and a toe kick.

Looks grim, fire escapes are very difficult to engineer and these folks weren’t even close.