## Design of Post embedment in concrete.

## Design of Post embedment in concrete.

(OP)

I have seen the following formula for designing post embedment in concrete:

a = (2M^2 + 3LM)/3M + 6L

Do you know where I can find this formula?

Other engineers have used it to calculate embedment of guardrail's posts in concrete.

a = (2M^2 + 3LM)/3M + 6L

Do you know where I can find this formula?

Other engineers have used it to calculate embedment of guardrail's posts in concrete.

## RE: Design of Post embedment in concrete.

## RE: Design of Post embedment in concrete.

M = Embedment of guardrail post in cobcrete slab usualy equal to 4"

L = The height of post over finish floor (or slab)

this value should be 42" as per all local codes.

a= distance of first triangular stress below finish floor

after a is obtained other engineers have used it to calculate the force below concrete using this formula

P2= (a^2 x p)/[mx(2a-m)]

Where p is the lateral force on top of the post and as per local codes this force should be 200lb

Thanks for your help.

## RE: Design of Post embedment in concrete.

Regards

Andy Machon

## RE: Design of Post embedment in concrete.

a= 2 M2 + 3L.M /3M + 6L

P2= a2 x P / [M(2a-M)]

M is the embedment length of the post in the concrete slab

L is the height of the guardrail post

P is the lateral load applied on the top of the post described abve

P2 is the resisting force to P below concrete slab