@cliff234: I asked Vulcraft this question and their response is that a load like you describe is accounted for in the design live load. Not the greatest answer.
BAretired: I agree the proposed 14" long foot is not going to work. The shear and moments within the panel don't compute, as you noted. My intent at this point is to tell the solar array folks that the feet supporting these arrays need to be lengthened such that the original joist design load...
lexpatrie,
Thanks for the response. This is an existing structure, about 25 years old. The joist design is a TL/LL of 275/150. That's what the joists are designed for as I have access to the structure record drawings and the joist submittal drawings. Patterned live load is a good point...
Hello all,
I am aware of the "100 pound rule" regarding concentrated loads applied to joist top or bottom chords. I have a project with proposed solar array loads being applied to a roof framed with 1.5" decking over 16k bar joists spaced 5'-0" on center. The array concentrated loads are...
All,
The client cut out a sample of the material so we could definitively measure and weigh the material. The final analysis is a unit weight of around 31.4 PCF for the lightweight fill material. Just in case anyone was wondering. I didn't get to see the actual sample, but it was described as...
Interesting read. Thanks for the link.
Seems like this is most likely what it may be. I'm going to push the client to get a sample or confirm the actual material.
Unfortunately, there's not much to see. The material in question is sandwiched between the metal deck below and a built up roof above. May have to request a core of the roof to get something conclusive.
I caught what you were saying though. The self-weight of 43-44 psf is still way too high...
The roof is supported by 18 gage decking with an allowable total load of 48 PSF based on the panel data I found. The purlin spacing is 12.5'-13.33', depending on the location. If it was lightweight concrete at 115 to 125 PSF, the decking would not have survived.
Hello,
I have a question about a detail I came across in a set of Record Drawings for a structure built in 1972. The detail is attached. The detail references "LT. WT. INSUL. ROOF FILL". The roof fill is reinforced with 2" hexagonal woven mesh, which seems to essentially be chicken wire...
Thanks for the responses. I'm looking to clean up my own work and am always looking to see how others have handled their own calculation/report presentations.
Hello,
I have attached a pdf of some calculations from a precast manufacturer. Does anybody know what program they may have used to these? I don't care about the calculations, but the presentation format is nice and I'd like to look into using a similar type of software. I don't like some of...
