WIll this frame around sliding doors hold

[mar2805]

People hi!
Please look at the attached .pdf file.
Its an 3D model of a roof.
in Brown - wood material
in White - masonry material

This is an egsisting attic under an wooden roof.
I didnt draw the side walls of the building.
YOu can see the load bearing walls under the masonry columns of the attic.
There are no load bearing walls under the wooden columns


The plan is to redecorate the attic into a new living space BUT without changing the height or the sloop of the roof!

My main concern is the new terrace space with its BIG SLIDING DOORS wich will be fixed in the "wooden frame".
Doors are 2,20m in height and 3,00m long.

With this dimensions door can be inserted under the bearing wooden beam and between the two wooden columns.
Im not ceratin if this is an safe design
Will this hold or I need to provide additional members to stiffen this situation?

Any advice is more then welcome.

Thank you

 

[JAE]

Your attachment was a white sheet of paper when I downloaded it.

Check out Eng-Tips Forum's Policies here:
faq731-376

 

[mar2805]

Try here here:

http://www.datafilehost.com/d/330a31a2

Its an file called rooff.pdf
You need AcrobatReader to view the model.

 

[msquared48]

Looks like a great snow trap to me...

Mike McCann, PE, SE (WA)

 

[mar2805]

Not much snow, where it is build
Can anyone answer or sugest an solution.

 

[jayrod12]

I'm assuming your concerns are lateral and not vertical. Dormers are framed all the time, I guess I see this as a reverse dormer. I would likely be beefing up the roof rafters on either side of the new roof opening and checking the diaphragm capacity of the new (now shorter) diaphragm depth. Same design philosophy as openings in shear walls.

As for the gravity load case, there's no way any one could realistically comment without some spans and sizes, right now it's just a pretty rendering. I've found that deflection generally governs for large door openings like this. Patio doors are generally not happy when the beam deflects above them.

Although if you don't have to worry about snow then it's unlikely gravity loads will govern.

 

[mar2805]

Hi jayrod
What do you mean when you say "beefing up the roof rafters"?

 

[msquared48]

Sistering in on new members


Mike McCann, PE, SE (WA)

 

[mar2805]

Im sorry but this is probably what you call "sleng".
English is not my primary language.
Any chance you could post and drawing or an better explenation.
Thank you.

 

[jayrod12]

I mean adding an additional rafter or two at either side of the roof diaphragm opening. I would also be blocking between the rafters over the floor beam and fastening the roof sheathing to the new sistered rafters and the blocking. Then as long as you aren't overstressing the new shallower diaphragm then it's likely you are ok.