Thought some people here might be interested in the seminar linked below....
Mass timber is a pretty new building type, not even permitted in larger buildings until fairly recently. The folks out west are old hands by now, but it's brand new for the rest of us.
Part one is more about the financial side. Part 2 is the architectural nuts and bolts.
Hopefully, they'll cover shrinkage. I'm running across that more and more in litigation. Architects just don't seem to know much about that and its getting them sued. Quick summary; expect somewhere between 1/4 and 1/2 inch per floor of shrinkage... with a ton of caveats. Anyway, lots of other things won't shrink; plumbing stacks, curtainwalls, exterior materials, etc. So, the taller you get, the worse the issue.
Mighty, that's probably the same range as any stick built construction. And yet the buildings aren't falling to pieces. We try to design with that in mind whenever we do anything in wood frame.
Feb 10, 21 6:59 pm ·
·
mightyaa
Agreed bowling. But most stick framed buildings are 2, maybe 3 stories, so we normally deal with fractions of inches...you'll see that with normal deflection in some cases. But now make it 6-8 stories and those fractions add up... several inches of shrinkage. At that point, you sort of need to know about it and design for it because standard practices won't work. Structural engineers usually at least understand it... your mechanical and fire suppression guys probably have no clue. So your main verticals like fire mains, stay a constant length; the building around it does not. Can it flex 6-inches? An inch... sure. Two? pushing it... Three? Elbows crack, supports rip out, etc. It becomes a stress test.
Mass Timber seminar
Thought some people here might be interested in the seminar linked below....
Mass timber is a pretty new building type, not even permitted in larger buildings until fairly recently. The folks out west are old hands by now, but it's brand new for the rest of us.
Part one is more about the financial side. Part 2 is the architectural nuts and bolts.
https://www.eventbrite.com/e/m...
nice. everyone get on board! great stuff to work with
can't make it, but looks like a good one...!
Hopefully, they'll cover shrinkage. I'm running across that more and more in litigation. Architects just don't seem to know much about that and its getting them sued. Quick summary; expect somewhere between 1/4 and 1/2 inch per floor of shrinkage... with a ton of caveats. Anyway, lots of other things won't shrink; plumbing stacks, curtainwalls, exterior materials, etc. So, the taller you get, the worse the issue.
Just stay out of the pool...
Mighty, that's probably the same range as any stick built construction. And yet the buildings aren't falling to pieces. We try to design with that in mind whenever we do anything in wood frame.
Agreed bowling. But most stick framed buildings are 2, maybe 3 stories, so we normally deal with fractions of inches...you'll see that with normal deflection in some cases. But now make it 6-8 stories and those fractions add up... several inches of shrinkage. At that point, you sort of need to know about it and design for it because standard practices won't work. Structural engineers usually at least understand it... your mechanical and fire suppression guys probably have no clue. So your main verticals like fire mains, stay a constant length; the building around it does not. Can it flex 6-inches? An inch... sure. Two? pushing it... Three? Elbows crack, supports rip out, etc. It becomes a stress test.
thanks!
I’ll try to ask any other questions that people here think of as well
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