What is an MPC 16 x 5 3/4 x 22 on a roof framing plan?
What is an MPC 16 x 5 3/4 x 22 on a roof framing plan?
(OP)
We are working on checking the feasibility of retrofiting some heavy items onto the roof of a fairly large building in Southern CA. Building was built in 1979 and we have the structural plans. The roof framing plan calls out structural members none of us have heard of before. Plans are hand drawn, and the handwriting is kind of hard to read, so the members are either MPC 16 x 5 3/4 x 22 or MFC 16 x 5 3/4 x 22. The framing is a grid with what look like purlins at 8' oc and one big main center beam. All the same. Anyone have any idea what these are?





RE: What is an MPC 16 x 5 3/4 x 22 on a roof framing plan?
RE: What is an MPC 16 x 5 3/4 x 22 on a roof framing plan?
We thought glulam was a possibility too, but can't figure out what all the numbers would be. 16 and 5 3/4 could make sense despite being non-standard today, but the last number is definitely not a length number. Maybe a grading designation?
Details imply that they may be structural steel.
RE: What is an MPC 16 x 5 3/4 x 22 on a roof framing plan?
RE: What is an MPC 16 x 5 3/4 x 22 on a roof framing plan?
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: What is an MPC 16 x 5 3/4 x 22 on a roof framing plan?
The best I could come up with is that sometimes wood trusses are called metal plate connected (MPC) wood trusses. Still can't figure out what all numbers would mean if that were the case though.
RE: What is an MPC 16 x 5 3/4 x 22 on a roof framing plan?
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: What is an MPC 16 x 5 3/4 x 22 on a roof framing plan?
MPC... multiple ply construction? Do you have a photo?
Dik
RE: What is an MPC 16 x 5 3/4 x 22 on a roof framing plan?
We just picked up on the fact that there are some W section structural steel moment frames called out on a couple of the grid lines. Could it be that MFC means Moment Frame Compatible with the corresponding numbers being the envelope of dimensions the strucutral member needs to fit within to frame into the moment frames? Perhaps this technique would be used if the roof framing plan is handed off to a steel detailer who might size the intermediary framing members to be something cost effective or readily available. The framing members wouldn't have to be that strong, roof live load is only 20 psf with a max span of 32'. I've never seen that before, but it is a plausible explanation.
RE: What is an MPC 16 x 5 3/4 x 22 on a roof framing plan?
RE: What is an MPC 16 x 5 3/4 x 22 on a roof framing plan?
Enough guessing - visit the site and take some pictures!
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: What is an MPC 16 x 5 3/4 x 22 on a roof framing plan?
RE: What is an MPC 16 x 5 3/4 x 22 on a roof framing plan?
RE: What is an MPC 16 x 5 3/4 x 22 on a roof framing plan?
RE: What is an MPC 16 x 5 3/4 x 22 on a roof framing plan?
RE: What is an MPC 16 x 5 3/4 x 22 on a roof framing plan?
On detail 1 it shows the connection between the W-Bm moment frame and what looks like a W-Bm purlin that is one of the roof framing members that is called out on the plan sheet as an MPC member. Detail 2 also shows a side view of what looks like a W-BM, but is labeled an MPC12.
What the heck is that??