Steep Steel Joist Roof
Steep Steel Joist Roof
(OP)
I have a job which will have very steep (8.75:12) roof framed out with steel joists. I am working on the detail and would appreciate it if you all would review the attached details and provide your input/recommendations.
My primary concerns consist of:
My primary concerns consist of:
- Diaphragm shear transfer at the perimeter of the roof (detail 3).
- Diaphragm shear transfer at the ridge (detail 4). My intent is to make the deck behave monolithically.
- Bearing seat details, I am utilizing Bent PL3/8" for bearing seats, is this conventional construction at this depth?. Also, I have seen in other consultants details that they don't design the bearing seat but appear to leave it up to the joist engineer. Is this standard practice?
- I have added a PL1/8 on top of the HSS collector to match the slope of the deck. Is there a better way to ensure a positive shear transfer from the deck into the collector?






RE: Steep Steel Joist Roof
I think that the joist supplier would prefer designing their own seats, but we've had some flaky experiences with them recently, so who knows?
RE: Steep Steel Joist Roof
RE: Steep Steel Joist Roof
Use of the chart to show different joist depths based on slope is applicable - but again, the manufacturer will take care of this.
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