Frame for roof extension

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Hi all, thought I'd post some photos of my current home shop project. I'm extending the roof in front of the shop 12' to give me shop covered work area, since I do such a good job keeping he inside clear.I set two 6"x6" 1/4" wall post in the concrete. The frame is a 2"x4" 1/4" rectangle tube welded to 4" sch. 40 pipe ( it's what I had and needed to use up). I placed a 1" gusset at the peak and notched the pipe to fit over. The 2X4 will set in notches in the posts, the pipe will end at the post. Go easy on my torch work, been a while since playing with 1" plate. I'm welding everything with a MM 251, .035 wire.
Reply:Your torch work is ok, your welding with mig.......grind clean BEFORE welding you will get more satisfaction aftersince the expected function and end result is unknown to me, i question myself about the need for 1 inch thick plate there ?
Reply:No need for 1" plate, just what I had. Kinda like a conversation piece. I'll use it for a connection point for some lifting.I did grind the areas that will be mig welded, it don't look like like it here as it gets rained on right away. I need to redo the vertical one for sure. I'm pre fitting now, will grind bevels and rust off before weld out.Thanks.
Reply:That cover will be nice out front of your shop.  Should give you a lot of extra useable space.
Reply:Well I'm about done, just need to cut out a notch in the post for the 2X4 tube to set in. Waiting on being able to use a small boom truck to fly it in. I'll be bolting the 4" aluminum channels to the tabs. Not real happy with the appearance of the welds, just couldn't seem to get in the groove on this one.Sandblasted and painted with Rustoleum epoxy primer.
Reply:cbacres1So far - things look really bad - I cringe at seeing anymore!Opus
Reply:Originally Posted by OPUS FERROcbacres1So far - things look really bad - I cringe at seeing anymore!Opus
Reply:Design you have is very poor at best. Thin round or square tube is poor in bending over long distances. Stacked the way it is doesn't gain you a lot.  A better design would have been something like an I bar truss. The material is separated farther apart. The top member usually takes the compression, the lower member the tension, and the middle parts just need to keep the two a distance apart. The closer you move those two parts in towards the center, the less strength you get for the same weight.The gusset plate you added to the middle bears on the weakest part of the square tube. If it really is loaded, you'll cause the center of the wall to collapse. Once the wall starts to collapse, you seriously degrade the strength of the tube to carry loads. Better place would have been 2 gussets in line with the outside walls of the tube. That way the wall would take the load and not bend as quickly as the center will.Steel posts buried directly in concrete isn't the greatest way to anchor columns. True it's done on occasion, but there are some pretty serious disadvantages to doing so. Concrete itself is both porous as well as slightly corrosive. Most times the columns are bolted to footings and then the floor is poured over them to simply cover up the connections if crete is poured around columns. In many cases for things like you show, they don't even bother covering the connection, but bolt the column to the footing with the floor in between the two.I haven't seen how this is going to bear on the posts so I won't comment on issues I might see there. Straight rafters like this produce a lot of outward force. Your columns need to counter this force and your connections will be the way the forces get transferred.You don't have your location listed, so I have no idea if you are in Florida or Alberta. If you are in the south where wind is probably your biggest danger, you may be fine. If you live in an area that gets heavy wet snow fall, this wouldn't inspire me with trust..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:Here is some details I haven't posted.You hit on very valid points. The tubing is 3/16" wall, the pipe sch. 40. Not what I consider thin. I started out with a truss design as you stated, but was wanting to gain more clearance in height.This design was run through load design software, which allowed lifting approximately 1,000 lbs with less than 1/8" deflection. The frame will connect to the 6" square tubing post by slots cut in the post for the 2 x 4 tubing and the pipe will be welded to the inside face of the post. 2 x 4 tube braces will be added from the post to the bottom of the pipe.The gusset is 1", so it is spread out over the tube somewhat, the 4" pipe is notched around the plat and fully welded.I'm in SW Florida a, so wind is my biggest concern. I agree with any loading such as snow, but not a issue here.I based the post foundations on what I've seen done around here ( permitted/ engineered projects). Again, wind uplift was my concern, not load bearing on these post.I've set many of the base plate post, didn't want any plates above grade and figuired this is plenty good for what I'm doing.i have a " baseplate" on the post, a rebar mat on the bottom, concrete on top of the baseplate, just no bolts.Thanks for your feedback, I can see you have a background in this.Last edited by cbacres1; 11-18-2014 at 07:48 AM.
Reply:Looks good so far!
Reply:run it.Now I lay me down to sleep, by the bed a Colt I do keep.Should I wake and find you inside, a coroner van is your next ride.
Reply:cbacres, what goes on the top? R-panels?http://www.facebook.com/Knappmobilewelding
Reply:For something that is not going to have a snow load on it, it is more then adequate.  I don't agree with a lot of the negatives about this, I've seen farmers use spruce 2x6's to create similar around here. The concrete will corrode the steel.....through time, but then what in the world doesn't deteriorate?
Reply:Originally Posted by Knappweldcbacres, what goes on the top? R-panels?
Reply:Here's my update. Finally got it into place. Angles fit nicely on the face of the columns. Had to break out the stick welder, too windy for the mig. I need to install angled braces from the bottom of the pipe to the side of the column, detail the tops of the columns and I'm done with this part.Thanks for the feedback.I figuire I can load test by lifting my AB 330 on it, that is a easy 800 lbs.
Reply:Thanks for the post.  I know you will be happy to have the extra covered space.