Jump to content

Myth or fact if the horizontal post in a Box End Assembly otherwise known as a H Brace needs to 2.5 times the height of the fence and Engineering explained


Recommended Posts

Hi 

What i am trying to determine,  is it a myth or fact that the horizontal post of a Box End Assembly otherwise known as a H Brace needs to be about 2.5 times the height of the fence, from what i have heard if this is shorter than 2.5 times the height of the fence this can weaken the Box End Assembly.

For example if the fence height is 1.2m then based on this rule above the horizontal post of the Box End Assembly will need to be 3m long.

Does anyone know if this rule that the horizontal post in the Box End Assembly needs to be 2.5 times the height of the fence a myth or fact? 

Also if anyone does know the engineering or if an engineer can explain the engineering behind this and can they provide the engineering calculation so we can use this to work out the required length of the horizontal post depending on fence height?

Thanks 

For anyone that doesn't know what a Box End Assembly otherwise known as a H Brace please read the below and see attached picture

The typical Box End Assembly is a wooden box consisting of two vertical posts each 2.2 meters long and a stay 3.3 meters long. The vertical posts are set 100cm into the ground and the stay is attached to the vertical posts 120cm above the ground. A wire or steel rod brace is attached to the top of the front post just below the horizontal stay and is tied back to just above ground level on the back post. Please see attached picture for more information.

Box End Assembly.jpg

Link to comment
Share on other sites

  • 1 month later...

In my experience on a box end the key is to have as low of any angle as possible on the brace wire.  

Keeping the brace 2.5 times the fence height and no higher than 1/2 to 2/3 the height will provide a lower angle.  

A high short brace will leverage the king post out of the ground.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...