Why?
Why?
(OP)
When I tell the curtain wall manufacture that my post composite deflections for perimeter beams will be l/600 or 1/2" max do they look at me surprised and wonder how they are going to deal with such a large deflection?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: Why?
RE: Why?
RE: Why?
If they don't understand - then they don't know what they are doing. But 1/600 should be OK - What is the rest of the building doing??
RE: Why?
RE: Why?
I agree that obviously they are not good enough.
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: Why?
RE: Why?
RE: Why?
It has always been required for designers to check for the manufacturers requirements and they are always low, as it is more expensive to allow for greater deflections. In a competetive environment, they always quote on the cheapest alternative (for the curtain wall) to win the work, so the least deflection. There used to be one manufactirer in UK who required 0mm deflection. He did not win may contracts.
Larger deflection limits are possible but they cost a lot!