16'8"x7'0" garage door lintel for masonry w/ 8 ft ceiling

[eng003]

I have a small cmu residential structure w/ roof spanning 32' that will need to bear on a garage door lintel. No snow or seismic but high winds 129 ult. The lintel will need to span for a 16'8" garage door specified as 7'0" tall by designer. Since there is only enough room for one cmu course I don't think one prestressed/precast lintel serving as both bond beam and lintel could work?? I am interested in how others would typically detail this? precast? steel shape? concrete beam? limit garage door height? Thanks

 

[slickdeals]

What kind of roof framing is it? Need some more information or a sketch, perhaps.

 

[eng003]

Pre-engineered wood trusses in hip configuration garage door near corner. Hip girderto bear on lintel.

 

[MiketheEngineer]

Steel I-beam??

 

[msquared48]

Yes - steel beam, but a tube section as it will be loaded on both axes at the same time.

Mike McCann
MMC Engineering

http://mmcengineering.tripod.com

 

[eng003]

This situation has to be very common right, so steal beam or tube is the common detail? how about connections at the end to provide continuity with the bond beam reinforcement? I don't like mixing wood and masonry/concrete in the same structural wall element but I know the contractor is going to ask why he can't use a glulam or parralam...is this a viable option? if not...what are some good reasons I can provide...besides I just don't like the idea?

Thanks,

 

[spats]

Yes, you can provide a reason... engineered wood beams would not work for that span if you're limited to only 8" of depth. See attached pages from Weyerhaeuser literature. I doubt if you'd get a glulam to work either.

 

[racookpe1978]

A rectangular steel tube that long is going to be less than 4.00 - 6.00 per foot.

Good find of seeing the detail that would have failed if it were made of wood. But, you've already spent more (of your time) addressing the issue than the tube steel is worth.

Your choices lay between a thicker wall (1/4, 3/16, 1/8, 11 gage, 14 gage for example) and a deeper section that may not need to be as wide: a thicker wall of course will let you use 6 or 4 inch TS deep for example, rather than 6 or 8 inch deep section.

Don't know what will be the best final choice -> much will depend on availability from your local steel shop. Getting something that short "from stock" will be cheaper than ordering a "perfect" piece from out-of-town.

Assume 6x1-1/2 tube steel, 14 g. To attach siding to the lintel, bolt a wood face to the side of the tube steel, then have your carpenters nail the siding/insulation/etc to the wood.