Cantilever gate concrete foundation calculation
Cantilever gate concrete foundation calculation
(OP)
Hello everybody,
I would like to have to have your expertise in determining a foundation for a cantliver gate.
This his cantilvere gate measures 12m (opening) and has an overall length (with extension) 17.3m and has a mass of 1590Kg maximum.
According to various sites and online configurators, I determined the mass of the foundation (including taking into account the depth of the sole which must be at least 50cm in my region).
However, and unless I am mistaken, this foundation must also meet the condition of not overturning the gate subjected to the wind force. According to a wind specification, the maximum wind speed in my region is 120Km / h and this exerts a dynamic pressure of 71.5daN / m ^ 2.
In the attached document, there are the dimensions calculations, estimate of the foundation, wind force, various calcul of the moments ... but unfortunately I dont have the necessary skills to validate "the concrete foundation".
My basic training is in power fluid hydraulic engineering, thank you in advance for your patience and for being forgiving if my intellectual approach is not the right one.
Thanking you for your help
I would like to have to have your expertise in determining a foundation for a cantliver gate.
This his cantilvere gate measures 12m (opening) and has an overall length (with extension) 17.3m and has a mass of 1590Kg maximum.
According to various sites and online configurators, I determined the mass of the foundation (including taking into account the depth of the sole which must be at least 50cm in my region).
However, and unless I am mistaken, this foundation must also meet the condition of not overturning the gate subjected to the wind force. According to a wind specification, the maximum wind speed in my region is 120Km / h and this exerts a dynamic pressure of 71.5daN / m ^ 2.
In the attached document, there are the dimensions calculations, estimate of the foundation, wind force, various calcul of the moments ... but unfortunately I dont have the necessary skills to validate "the concrete foundation".
My basic training is in power fluid hydraulic engineering, thank you in advance for your patience and for being forgiving if my intellectual approach is not the right one.
Thanking you for your help
RE: Cantilever gate concrete foundation calculation
I would suggest you get a local structural engineer and a local geotechnical engineer involved to assist with this. This is not a simple gate structure.
RE: Cantilever gate concrete foundation calculation
You might be better off to redesign the gate as follows, it might simplify the gate and foundation designs, and also improve the operational mechanics.
1. Put wheels under the left and right bot. corners of the gate. These might be “V” grooved steel wheels made to run on an angle iron runner with its toes down, or just on an upstanding steel bar (1” x 2” high). Put small plow bars in front and back of each wheel, almost touching the upstanding stl. bar to clean it off with gate motion. Maybe a center wheel too, to reduce gate bending moment. The gate can now be about 13-14m long, (your “B” dim. +) since you don’t need the 5.3m (your “R”) backspan any longer.
2. The primary foundation then becomes a conc. grade beam, in line with the gate motion, to which the above upstanding stl. bar, runner, is fixed. Maybe with a horiz. bot. flange fixed to or into the grade beam. This runner bar and the grade beam would be about 25-26m long, (13-14m + 12m) for full motion of the gate.
3. You still need the left hand post, one post on the right in your sketch (not two posts), and maybe another at the full gate movement, or .75 gate movement, further to the right. These posts probably have to be set in drilled piers to take the lateral loads, wind and the like. At the right post (or posts) you need guide wheels running on the top and bot. gate rails (both sides) to guide the gate movement and take the lateral loads into the posts.
4. The top and bot. gate rails (your “1” & “2”) need to be fairly stiff in the horiz. direction to take the lateral load bending of the gate. But, you no longer need your bot. “slide profile”. There is some confusion about the numbering here (“6” or “8”)?
RE: Cantilever gate concrete foundation calculation
RE: Cantilever gate concrete foundation calculation
RE: Cantilever gate concrete foundation calculation
RE: Cantilever gate concrete foundation calculation
many thanks for your feedback. Well, to be honest i did follow as per cantliver gate maker "ROB" for the calculation but not sure if for the concrete foundation they are taking into the account the wind load :
http://www.rob-systems.be/productbuilder/variazelf...
As suggested, i will follow yur recommandations and consult a geotechical engineer.
Best regards and happy new year
Bruno
RE: Cantilever gate concrete foundation calculation
I looked to the calculation report provided by the supplier.
Apparently they have calculated the wind but did not consider accidental force ( impact etc)..
The proposed ftg size = 5.8m L, 0.8m H , and 0.5 m W ..
The max . soil stress σs > 50kN/m2 .. which should be around 20 kN/m2 .. check the soil conditions ..
I will suggest to increase the width.. around 0.8 m. better change the width with depth if there is no geometric restriction for the erection of rails etc.