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Wind Load tables for aluminum ceiling panels
- Thread starter ajk1
- Start date
ajk1...are the ceiling panel extruded or rolled from coil stock? Extruded panels are usually proprietary shapes as the company usually has to pay for the dies, so they don't let just everyone use them. They will usually provide the section properties along with their other company information.
If they are rolled from coil stock, then you'll have to get the info that most closely approximates the section properties, such as roofing sheets or similar. Most rolled sections are similar, with one or two stiffener crimps and a seaming profile.
Manufacturers are not noted for providing a lot of information like what you're looking for, so you might end up just having to calculate everything from the section properties.
I have also had to make my own measurements of the sheets to get the properties.
The alloy for the sheets is probably 3003.
If they are rolled from coil stock, then you'll have to get the info that most closely approximates the section properties, such as roofing sheets or similar. Most rolled sections are similar, with one or two stiffener crimps and a seaming profile.
Manufacturers are not noted for providing a lot of information like what you're looking for, so you might end up just having to calculate everything from the section properties.
I have also had to make my own measurements of the sheets to get the properties.
The alloy for the sheets is probably 3003.
- Thread starter
- #4
Thanks Ron - I suspect they are rolled. They are 0.022" thick (with some sort of coating on the non-visible side of the panel), as measured with a digital micrometre and about 7" wide and turned up about 3/4" at each edge; the turnup has a crimp in it. The top of the turn-up has about a 1/8" wide horizontal lip that is engaged along its length by tabs in the carrier channels above. I have calculated the capacity of all the various components of the panel and the suspension system above and they are almost all very weak - good generally for 3 to 10 psf wind.
I just wondered if the capacity of this type of system might have been established by the manufacturers by load testing rather than calculation.
The panels are dislodging in high winds. I suspect one of the problems is that the 1/8" lip is too narrow and when the panel flexes in the direction tansverse to its span, the lip disengages from the tabs of the carrier channel above.
I wondered what wind suctions and pressures ceiling panels are nomally designed for. I would think it should be in the 20 to 30 psf range; I wondered what the details of the usual carrier channel might be.
I just wondered if the capacity of this type of system might have been established by the manufacturers by load testing rather than calculation.
The panels are dislodging in high winds. I suspect one of the problems is that the 1/8" lip is too narrow and when the panel flexes in the direction tansverse to its span, the lip disengages from the tabs of the carrier channel above.
I wondered what wind suctions and pressures ceiling panels are nomally designed for. I would think it should be in the 20 to 30 psf range; I wondered what the details of the usual carrier channel might be.
- Thread starter
- #7
I realize that. We are having temporary battens installed next week to prevent the panels becoming windborne. But this has to be followed up with a permanent solution meeting the Ontario Building Code. We would be assisted in this regard if we can find published data on the details of a properly designed aluminum ceiling system to resist wind loads .. so we don't go overboard in the repairs.
- Thread starter
- #8
Can no one point me to any manufacturer's data on load span tables and profile details for linear aluminum ceiling panels? Or for that matter, for aluminum cladding? Anyone had experience with aluminum ceiling panels disengaging in winds (80 km/hr)?
ajk1...I don't think you'll find that. Soffit and ceiling panels are non-structural, so why would a manufacturer spend the money to develop load tables? Attachment is obviously the key to this. Consider the panel to be competent between fastenings and apply an appropriate tributary area coefficient for the fastener pullout. If the fastening is into purlins or subpurlins, then consider those to be structural and transfer the load accordingly.
For "C" shaped, rolled panels you'll have to compute the section properties but that's fairly straightforward. Don't worry too much about getting the radius computed exactly...it won't make that much difference. If you are concerned about bending then you can use the properties...if you just want to consider that you don't care too much about deflection (there are no criteria anyway that I know of) and you just want to make sure they stay attached, ignore the properties, though you might want to check pullover at the fastener heads.
You can consider whether to use side lap fasteners at the legs or mechanical crimping. The more side lap fasteners you use, the more resistant to bending the section will be.
For "C" shaped, rolled panels you'll have to compute the section properties but that's fairly straightforward. Don't worry too much about getting the radius computed exactly...it won't make that much difference. If you are concerned about bending then you can use the properties...if you just want to consider that you don't care too much about deflection (there are no criteria anyway that I know of) and you just want to make sure they stay attached, ignore the properties, though you might want to check pullover at the fastener heads.
You can consider whether to use side lap fasteners at the legs or mechanical crimping. The more side lap fasteners you use, the more resistant to bending the section will be.
- Thread starter
- #10
Ron - I do not follow your explantion of why aluminum ceiling manufacturers would not publish load span tables for exterior ceiling subject to wind load. Steel cladding manufacturers do, why not aluminum cladding manufacturers????
Although it is elementary how to calculate the strength, I am more interested in what range of wind loads the manufacturers are marketing their deck and girts for, and the EXACT DETAILS OF HOW THEY FASTEN THEM TOGETHER. I don't know how familiar you are with linear ceiling systems, but normally in linear ceiling systems neither crimping nor screws are used to fasten the ceiling deck to the girts. It is doen by mechanical tabs and tongur and groove type interconnection. Note that the whole system, girts and ceiling panels are marketed as a system.
Although it is elementary how to calculate the strength, I am more interested in what range of wind loads the manufacturers are marketing their deck and girts for, and the EXACT DETAILS OF HOW THEY FASTEN THEM TOGETHER. I don't know how familiar you are with linear ceiling systems, but normally in linear ceiling systems neither crimping nor screws are used to fasten the ceiling deck to the girts. It is doen by mechanical tabs and tongur and groove type interconnection. Note that the whole system, girts and ceiling panels are marketed as a system.
ajk1...here's an aluminum panel load table for linear ceilings using tongue and groove...
Aluminum Ceiling Panels
No, I am not that familiar with these systems...I am very familiar with extruded aluminum panels, roof panels and attachment systems for those.
Good luck.
Aluminum Ceiling Panels
No, I am not that familiar with these systems...I am very familiar with extruded aluminum panels, roof panels and attachment systems for those.
Good luck.
- Thread starter
- #12
Ron - this is helpful. Now I will try going to their site and see if they give the dimension of the horizontal groove (I am interested in how much interlock there is) and also whether they give the details of the girt that would support this ceiling panel and how it is fastened to the to the ceiling panel. In the case I am investigating there are tabs on the girt into which the lip on the ceiling panel is inserted but the panel lip is only 1/8" wide so there is only 1/8 inch of overlap.
Thanks for your help.
Thanks for your help.
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