Beam Deflection Criteria for sliding door...
Beam Deflection Criteria for sliding door...
(OP)
I have an open corner that will be framed out using a cantilevered steel beam on one side and a simple span beam framing into it on the other. The sliding door manufacturer said that he usually tells engineers to design for zero deflection. There is a green roof being supported by this cantilever (8" of soil/plantings) so the load is significant. The cantilever is 6' long with a 13' back span (19' total).
There has to be some tolerance right? They can't ask for zero???
There has to be some tolerance right? They can't ask for zero???






RE: Beam Deflection Criteria for sliding door...
For sliding doors, I usually design for live load deflection less than 3/8".
RE: Beam Deflection Criteria for sliding door...
That would be like us telling him that his door can weigh zero pounds or else the framing below could collapse.
He gave a stupid, lazy response to a reasonable question.
RE: Beam Deflection Criteria for sliding door...
RE: Beam Deflection Criteria for sliding door...
RE: Beam Deflection Criteria for sliding door...
RE: Beam Deflection Criteria for sliding door...
Maybe the Architect could eliminate the water and soil on the roof and go with a brown roof?
Mike McCann
MMC Engineering
RE: Beam Deflection Criteria for sliding door...
RE: Beam Deflection Criteria for sliding door...
RE: Beam Deflection Criteria for sliding door...
Mike McCann
MMC Engineering
RE: Beam Deflection Criteria for sliding door...
I am sure you have considered this, however ensure you check all load cases, As I have come across a few designs where the final load case gave a more favorable deflection (Plus live load and soil etc) with regards to cantilevers and caused issues,
With regards to the deflection head, I ensure anything viable (balcony edge etc) I keep to 10mm, which is 3/8". I still ensure that all large windows have a 20 - 25mm deflection head, as concrete finish is rarely level anyway + change in load conditions,
regards,
"Structural Engineering is the Art of moulding materials we do not wholly understand into shapes we cannot precisely analyse, so as to withstand forces we cannot really assess, in such a way that the community at large has no reason to suspect the extent of our ignorance." Dr. Dykes, 1976
RE: Beam Deflection Criteria for sliding door...
Msquared- you make me laugh...
What is the wall material around the door? Any possibility for a deflection connection between the wall material and the beam so the two are isolated?
Obviously I don't have any drawings or details so maybe I am imagining that incorrectly. Guessing the door frames right under the beam so a header beam and wall slip connections are not possible.
RE: Beam Deflection Criteria for sliding door...