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Old 03-28-2007, 02:13 PM   #1
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Post anchors


Building a 12x16 "gazebo"- roof, no walls, 6 posts, concrete slab floor. Trying to find a post anchor to attach the posts to the footing. What I am finding is anchors for deck construction that don't offer any lateral stability. They are not made for free standing structures. Any ideas?

Also not interested in putting the posts in the footing or below grade. Need a very long term, rot free connection.

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Old 03-28-2007, 02:47 PM   #2
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If you insist on not going into the ground and are just trying to attach a post and get lateral stability you will not find anything with much lateral stability.

To get some stability, you can use diagonals between the posts and beam near the top. The stability will depend how long they are.

Because you have wood posts, you never can get a good long term connection that will transfer a moment from wind, etc. because of the instability and compression of the wood. That is why you always find sort of a brace for a good deck.

you can always use diagonal on the roof, but that just gives you a square roof structure, but does not help the posts.


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Old 03-28-2007, 08:01 PM   #3
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look at Simpson Strongtie HTT22 or similar girder truss to masonry hurrican tie. You can just put lags in the concrete to this connector.

www.strongtie.com


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Old 03-28-2007, 08:32 PM   #4
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The HTT22 is a tension tie that does not have much moment resistance. Some other pieces of harware may be better for making a frame more rigid, but probably not enough to prevent a collapse unless it was a very big gussset at the top corners in both directions. - Not a very light looking pergola.

It (the HTT22) is a good tension tie that can stop things from blowing away like Dorothy's house in the Oz movie.
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Old 03-28-2007, 11:25 PM   #5
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Post anchors


Thanks for the quick replies.
Looked at the Simpson site- What about the CBSQ Column Base? (sorry, don't know how to link) Is 10ga steel thick enough to do the job?

The reason I'm pushing in this direction is that I work for this old resort. The newest building we have was built in 1947 with the oldest from 1922. This is a long-term building, not a decoration in the back yard. I need to guarantee that it will still be around and safe in 50 years. Don't want the next caretaker to get stuck having to rebuild it when its supports rot out.

You see a lot of post construction pavilions around parks and rest areas- how are they anchored?

Last edited by Bob McSmith; 03-29-2007 at 09:46 AM. Reason: spelling
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Old 03-29-2007, 07:55 AM   #6
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Generally speaking, all the lateral support is provided by the gazebo roof itself, and the rail in between each post, which you don't have. Therefore, you will be relying on the roof, so lateral support is provided by the decorative gussets that are installed in the corner between the post and the roof. Also, sometimes a decorative "ladder" structure is added between posts which add stability. Besides the post anchors, I would also add at least two L brackets to the bottom of each post.
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Old 03-29-2007, 08:09 AM   #7
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A roof structure can only supply laterial support if there is continuity to the posts. If not, you can end up with the nice roof structure laying oon the ground on top of the posts.

It is not a question of anchoring for uplift, but you must have some lateral stength. The best is diagonals in at least one bay in both directions. Knee braces between the top of the posts and the roof construction may work, but is not as effective. Unfortunately people like to keep the sides open and not clutter up the floor.

I have not had a chance yo look at the SBSQ column base.
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Old 03-29-2007, 09:45 AM   #8
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We built a smaller structure, 10 x 10, years ago to cover a BBQ (think 8' stainless steel grill- 200 people for dinner). The roof and bracing did add strength, but because we used light weight post anchors, (deck post anchors), the whole structure was very wobbly. Eventually we boxed in the 4x4s, running the wood flush to the pour. That stabilized the building, but hardly the best solution to the problem.
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Old 03-29-2007, 02:28 PM   #9
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What about using a steel beam in concrete and use pre-made columns or make columns to make it nice, but the steel beams would make it very stable. Replacing a few boards here and there is expected but this might help from the entire structure from having to be rebuilt.

Just an idea.

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