135 degree hooks in links (Detail) - BS8666-2005 1

[strawhats2000]

Hi,

I need some lights regarding part of the table in BS8666-2005 explaining length of bends or anchorage in bars. I am using this instruction to create a 135 degree hook which has better anchorage than a 90 degree hook. On the 3 other corners, I have already draw the links as per instructions.

I really don't understand what is meant and how we are supposed to understand the projection formulas and angles of 150 degree employed by the writers of the code. Especially that i need to apply this to a link with a 135 hook made of bar size 6 mm (shape code 51).

Anyone has any documentations where do we use the different shape codes??

Thanks and Regards,

Nicolas MARIE

 

[Agent666]

I believe its saying if you bend it to more than 150 degrees (i.e. tighter than 135 degree standard hook), then you can accept a shorter straight length after the bend (either radius + 1 bar diameter + minimum 5d or 10d straight, OR the total length listed will govern). The projection length simply follows the bend, and is taken from the tangent point is my interpretation of the requirement (I qualify this with the fact I'm not too familiar with BS concrete standard requirements, so hopefully someone else can confirm).

Like this crude drawing shows:-