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Does anyone know if there are tables or information for precast concrete beams from the late 50's to 60' for I-beam shaped beams (not rectangular). Here is a typical designation on the old plans C.J. 14x4 .51/120 (it may also be 1.20 due to the quality of the plans) or C.J. 8 x 3-1/2 .22/.81 Or...

StrEng007: I was finally able to get the images on the original post. I am not worried about the parapet itself just its effect on the roof pressures. I am looking at unit and roof deadloads and wind loads. The question is if the windward side of the roof behind a parapet can see a positive...

jayrod12: yes wind blows in all directions. the unit is installed close to one parapet. steel beam supports unit close to parapet and joist supports away from parapet. i'm concerned about compression on the joist - which is where this roof pressure comes into play StrEng007: existing roof...

yes, this is the problem. the unit is placed in Zone 2. and about half of the joist is located in zone 2. would there be a positive pressure on the roof on the windward side of the building? I would think it would be negative. I would only think there would be a positive pressure on the...

I am looking at the addition of a mechanical unit on a steel joist roof. The unit is resting on a steel beam on one long side of the unit and a joist on the other. ASCE7-22, Figure 30.3-2A, note 5 states there are different pressures near the parapets (see attached). The positive (downward)...

Thank you for the responses so far. MotorCity, the generator is a backup generator so it was not running at the time of the site visit. A little more background, they need to replace the piping through the wall of the building (block wall) and outside since the pipe is completely corroded...

I was at a jobsite yesterday and the generator exhaust pipe was running close to/touching the concrete beam overhead. See attached pictures. There is maybe 1/2" thick insulation wrap around the pipe. I have reviewed the Florida Building Code and NFPA37 for guidance on this and the most...

thank you all for the responses! I will proceed accordingly.

Not kidding. I have not found the formula in the AISC Steel Manual. I will try to look in the companion examples, good suggestion. The previous thread that was referenced also discussed how they couldn't find the formula as well. And actually it is Blodgett's book with Lincoln Arc Welding...

thread507-419698 just wanted to follow up on this thread. There is an equation for Nreq in Blodgett's Design of Welded Structures book. Page 5.2-2 equation (2): N = R/(t_w*(0.75*sigma_y))-K Do you think that equation is valid for Table 10-6?